{"id":112217,"date":"2025-08-05T06:00:00","date_gmt":"2025-08-05T13:00:00","guid":{"rendered":"https:\/\/www.backblaze.com\/blog\/?p=112217"},"modified":"2025-12-11T11:12:38","modified_gmt":"2025-12-11T19:12:38","slug":"backblaze-drive-stats-for-q2-2025","status":"publish","type":"post","link":"https:\/\/www.backblaze.com\/blog\/backblaze-drive-stats-for-q2-2025\/","title":{"rendered":"Backblaze Drive Stats for Q2 2025"},"content":{"rendered":"\r\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"880\" class=\"wp-image-112218\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Backblaze-Drive-Stats-Q2-2025.png\" alt=\"A decorative image showing vertical bars and that includes the Backblaze logo, as well as the title Backblaze Q2 2025 Drive Stats.\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Backblaze-Drive-Stats-Q2-2025.png 1440w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Backblaze-Drive-Stats-Q2-2025-300x183.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Backblaze-Drive-Stats-Q2-2025-1024x626.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Backblaze-Drive-Stats-Q2-2025-768x469.png 768w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\" \/><\/figure>\r\n\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 15px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>With hundreds of thousands of hard drives spinning 24\/7, our data centers are less like <a href=\"https:\/\/www.youtube.com\/watch?v=xePI1Np0MuY\" target=\"_blank\" rel=\"noreferrer noopener\">peaceful white-noise oases<\/a> and more like a a series of obstacle courses\u2014if said obstacle courses were about managing over four exabytes of storage from <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/solutions\/backup-and-archive\" target=\"_blank\" rel=\"noreferrer noopener\">archival backups<\/a> to <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/solutions\/media-workflow\" target=\"_blank\" rel=\"noreferrer noopener\">streaming media<\/a> to <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/industries\/ai-ml\" target=\"_blank\" rel=\"noreferrer noopener\">AI training datasets<\/a>. Sure, they&#8217;re obstacle courses we all (and I\u2019m including you, users of the internet) collectively create, but it\u2019s no less of a balancing act to find the contestants (erm, hard drives) that can go the distance.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>And we, dear readers, get to watch it all. Welcome to Drive Stats: where failure is inevitable, survival is fascinating, and every quarter brings a new leaderboard.<\/p>\r\n\r\n\r\n\r\n<p>As of June 30, 2025, we had 321,201 drives under management. Of that total, there were 3,971 boot drives and 317,230 data drives. Stay tuned as we take our standard peek into quarterly and lifetime failure rates, and do a deep dive into the 20TB+ club.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>As always, we\u2019ll see you in the comments section. This month, you\u2019ll also get three (count \u2018em, three!) opportunities to talk to us in person as well\u2014virtually at our <a href=\"https:\/\/www.linkedin.com\/events\/drivestatsq22025highlights7351656452786135041\/theater\/\" target=\"_blank\" rel=\"noreferrer noopener\">Drive Stats LinkedIn Live on August 5 (today)<\/a>, or twice in Las Vegas at <a href=\"http:\/\/hackertracker.app\/schedule\/?conf=DEFCON33&amp;tag=48106\" target=\"_blank\" rel=\"noreferrer noopener\">DefCon on August 7 and 8.<\/a>\u00a0<\/p>\r\n\r\n\r\n\r\n<p>And, after DefCon, we&#8217;ll be sticking around in Vegas to <a href=\"https:\/\/info.backblaze.com\/ai4-lv-2025\" target=\"_blank\" rel=\"noreferrer noopener\">attend Ai4<\/a> August 11\u201313\u2014stop by booth 226 if you&#8217;ll be in the neighborhood, and check out our colleague <a href=\"https:\/\/www.backblaze.com\/blog\/architecting-your-ai-data-pipeline-using-b2-overdrive\/\" target=\"_blank\" rel=\"noreferrer noopener\">Jeronimo De Leon&#8217;s talk on storage and AI<\/a> if you&#8217;re free.<\/p>\r\n\r\n\r\n\r\n<div class=\"abstract\" style=\"line-height: 1.8; margin: 24px 12px; padding: 24px 12px 10px 12px;\">\r\n<h4>Sign up for the Drive Stats LinkedIn Live<\/h4>\r\nReady to dive deeper into the data? Tune in today at 10:00 a.m. PT, to <a href=\"https:\/\/docs.google.com\/forms\/d\/e\/1FAIpQLSfnJ3JddtA6UJhbm7ofI4qiaB5Z0e6ndBtM5oex-Q2Jq-XN_g\/viewform?usp=dialog\" target=\"_blank\" rel=\"noopener\">query the Drive Stats team<\/a>, Stephanie Doyle and Pat Patterson. We\u2019ll see you there! <br \/><br \/><!--HubSpot Call-to-Action Code --><span id=\"hs-cta-wrapper-a58f6573-e61a-4b50-b981-9fc607a37231\" class=\"hs-cta-wrapper\"><span id=\"hs-cta-a58f6573-e61a-4b50-b981-9fc607a37231\" class=\"hs-cta-node hs-cta-a58f6573-e61a-4b50-b981-9fc607a37231\"><!-- [if lte IE 8]><div id=\"hs-cta-ie-element\"><\/div><![endif]--><a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/2832298\/a58f6573-e61a-4b50-b981-9fc607a37231\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" id=\"hs-cta-img-a58f6573-e61a-4b50-b981-9fc607a37231\" class=\"hs-cta-img\" style=\"border-width: 0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/2832298\/a58f6573-e61a-4b50-b981-9fc607a37231.png\" alt=\"Join the Conversation\" \/><\/a><\/span><script charset=\"utf-8\" src=\"https:\/\/js.hscta.net\/cta\/current.js\"><\/script><script type=\"text\/javascript\"> hbspt.cta.load(2832298, 'a58f6573-e61a-4b50-b981-9fc607a37231', {\"useNewLoader\":\"true\",\"region\":\"na1\"}); <\/script><\/span><!-- end HubSpot Call-to-Action Code --><\/div>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Drive Stats by the numbers: The digest version<\/h2>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1672\" class=\"wp-image-112219\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Q2-2025-Drive-Stats-_-Infographic-V1.png\" alt=\"An infographic summarizing key data points in this report, including drive count, drive failures, drive days, drive population by manufacturer, and a summary of the quarterly, annual, and lifetime AFRs. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Q2-2025-Drive-Stats-_-Infographic-V1.png 1920w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Q2-2025-Drive-Stats-_-Infographic-V1-300x261.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Q2-2025-Drive-Stats-_-Infographic-V1-1024x892.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Q2-2025-Drive-Stats-_-Infographic-V1-768x669.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Q2-2025-Drive-Stats-_-Infographic-V1-1536x1338.png 1536w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Q2-2025-Drive-Stats-_-Infographic-V1-1568x1365.png 1568w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 15px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Q2 2025 hard drive failure rates<\/h2>\r\n\r\n\r\n\r\n<p>For those that are new to the Drive Stats report, it\u2019s worth mentioning that we have certain criteria that we use to select drives for consideration each quarter. We\u2019ll discuss those in the next section, but for now, let\u2019s talk about the data. The table below shows the failure rates for Q2 2025.<\/p>\r\n\r\n\r\n\r\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\r\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\r\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\r\n<div class=\"wp-block-group is-vertical is-content-justification-center is-layout-flex wp-container-core-group-is-layout-4b2eccd6 wp-block-group-is-layout-flex\">\r\n<p class=\"has-text-align-center has-large-font-size\" style=\"line-height: 1.0;\"><strong>Backblaze Hard Drive Failure Rates for Q2 2025<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"has-text-align-center has-extra-small-font-size\" style=\"line-height: 1.1;\">Reporting period April 1, 2025\u2013June 30, 2025 inclusive<br \/>Drive models with drive count &gt; 100 as of June 30, 2025 and drive days &gt; 10,000 in Q2 2025<\/p>\r\n<\/div>\r\n<\/div><\/div>\r\n<\/div><\/div>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Quarterly-Q22025-1.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"Quarterly Q22025 (1)\" data-rl_caption=\"Quarterly Q22025 (1)\" title=\"Quarterly Q22025 (1)\"><img loading=\"lazy\" decoding=\"async\" width=\"889\" height=\"773\" class=\"wp-image-112248\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Quarterly-Q22025-1.png\" alt=\"The Q2 2025 quarterly Backblaze Drive Stats data. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Quarterly-Q22025-1.png 889w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Quarterly-Q22025-1-300x261.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/Quarterly-Q22025-1-768x668.png 768w\" sizes=\"auto, (max-width: 889px) 100vw, 889px\" \/><\/a><\/figure>\r\n<\/div><\/div>\r\n\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 15px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Notes and observations<\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>The annual failure rate is lower this quarter. <\/strong>We had some major fluctuations last quarter. Quoting ourselves from May 2025:<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\r\n<p><strong>The quarterly failure rate is slightly higher.\u00a0<\/strong>The quarterly failure rate went up from 1.35% to 1.42%. As with the zero-failure club, our higher-end outlier AFRs show some of the usual suspects:<\/p>\r\n<\/blockquote>\r\n\r\n\r\n\r\n<p>We\u2019re now back down to 1.36%. What\u2019s changed?\u00a0<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Big swings in our higher-end failure rates: <\/strong>Well, some of the drives with higher failure rates have come down quite a bit. Notably, that includes the 12TB Seagate model ST12000NM0007, which was at a whopping 9.47% failure rate last quarter\u2014down this quarter to only 3.58%. With its drive count holding more or less steady (1,038 in Q1 and 1,014 in Q2), that means a real change in failure rates. Note that this drive was at 8.72% in Q4 2024, so it\u2019s worth keeping an eye on whether this is a fluke or a new pattern. Other significant drops include the 12TB HGST model HUH721212ALN604 (Q1: 4.97%; Q2: 3.39%) and the 14TB Seagate model ST14000NM0138 (Q1: 6.82%, Q2: 4.37%).\u00a0<\/li>\r\n\r\n\r\n\r\n<li><strong>One new drive model on the way in: <\/strong>Welcome to the party, Toshiba MG09ACA16TE (16TB).<\/li>\r\n\r\n\r\n\r\n<li><strong>Zero failures for the quarter: <\/strong>Rising to the top, we\u2019ve got only two this time around:\r\n<ul class=\"wp-block-list\">\r\n<li>Seagate ST8000NM000A (8TB)<\/li>\r\n\r\n\r\n\r\n<li>Seagate ST16000NM002J (16TB)\u00a0<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p>That 8TB Seagate is really shining, given this is its third quarter running with zero failures.<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Bonus: One failure drives:<\/strong> Since we only have two 0 failures (and that just seems a little lackluster, doesn\u2019t it?), it\u2019s also worth mentioning the drives with only one failure this quarter:\u00a0\r\n<ul class=\"wp-block-list\">\r\n<li>HGST HMS5C4040BLE640 (4TB)<\/li>\r\n\r\n\r\n\r\n<li>Seagate ST12000NM000J (12TB)\u00a0<\/li>\r\n\r\n\r\n\r\n<li>Seagate ST14000NM000J (14TB)\u00a0<\/li>\r\n\r\n\r\n\r\n<li>Toshiba MG09ACA16TE (16TB)<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Drive model criteria<\/h2>\r\n\r\n\r\n\r\n<p>We noted earlier we removed 495 drives from consideration when we produced the table above covering Q2 2025. There are two primary reasons we did not consider these drive models.<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Testing.<\/strong> These are drives of a given model that we monitor and collect Drive Stats data on, but are not considered production drives at this time. For example, drives undergoing certification testing to determine if they are performant enough for our environment are not included in our Drive Stats calculations.<\/li>\r\n\r\n\r\n\r\n<li><strong>Insufficient data points.<\/strong> When we calculate the annualized failure rate for a drive model for a given period of time (quarterly, annual, or lifetime), we want to ensure we have enough data to reliably do so. Therefore we have defined criteria for a drive model to be included in the tables and charts for the specified period of time. Models that do not meet these criteria are not included in the tables and charts for the period in question.<\/li>\r\n<\/ul>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"119\" class=\"wp-image-112222\" style=\"width: 400px;\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/3_Drive-parameters.png\" alt=\"A table that outlines the drive inclusion parameters for each type of Backblaze Drive Stats report. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/3_Drive-parameters.png 1736w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/3_Drive-parameters-300x89.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/3_Drive-parameters-1024x304.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/3_Drive-parameters-768x228.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/3_Drive-parameters-1536x457.png 1536w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/3_Drive-parameters-1568x466.png 1568w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure>\r\n<\/div>\r\n\r\n\r\n<p>Regardless of whether or not a given drive model is included in the charts and tables, all of the data for all of the drives we use is included in our Drive Stats dataset which you can download by visiting our <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/hard-drive-test-data\" target=\"_blank\" rel=\"noreferrer noopener\">Drive Stats page<\/a>.<\/p>\r\n\r\n\r\n\r\n<p>As with the Q2 quarterly results, we will apply these criteria to the lifetime charts that follow in this report.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Lifetime hard drive failure rates<\/h2>\r\n\r\n\r\n\r\n<p>To be considered for the lifetime review, a drive model was required to have 500 or more drives as of the end of Q2 2025 and have over 100,000 accumulated drive days during their lifetime. When we removed those drive models which did not meet the lifetime criteria, we had 393,907 drives grouped into 27 models remaining for analysis as shown in the table below.<\/p>\r\n\r\n\r\n\r\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\r\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\r\n<p class=\"has-text-align-center has-large-font-size\" style=\"line-height: 1.0;\"><strong>Backblaze Hard Drive Failure Rates for Q2 2025<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"has-text-align-center has-extra-small-font-size\" style=\"line-height: 1.1;\">Reporting period ending June 30, 2025<br \/>Drive models &gt; 500 drives and &gt; 100,000 lifetime drive days<\/p>\r\n<\/div><\/div>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"4_Lifetime\" data-rl_caption=\"4_Lifetime\" title=\"4_Lifetime\"><img loading=\"lazy\" decoding=\"async\" width=\"2110\" height=\"1640\" class=\"wp-image-112223\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime.png\" alt=\"A table showing the lifetime Backblaze Drive Stats. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime.png 2110w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime-300x233.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime-1024x796.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime-768x597.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime-1536x1194.png 1536w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime-2048x1592.png 2048w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/4_Lifetime-1568x1219.png 1568w\" sizes=\"auto, (max-width: 2110px) 100vw, 2110px\" \/><\/a><\/figure>\r\n<\/div><\/div><\/div>\r\n\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 15px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Notes and observations<\/h3>\r\n\r\n\r\n\r\n<p>Again, the lifetime AFR holds steady, dropping from Q1 2025\u2019s 1.31% to 1.30%.\u00a0<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Now you see me: <\/strong>This quarter\u2019s table also gives us an interesting snapshot that has to do with our drive exclusions as the 4TB HGST model HMS5C4040ALE640 is on the way out. It meets our lifetime drive criteria, so it is included in this second table, but it didn\u2019t make the cut for the quarterly table because it had too few drives running by the end of the quarter. Usually you see the opposite, where drive models show up in the quarterly requirements but not the lifetime. This quarter, four models meet that standard (Seagate model numbers ST8000NM000A, ST14000NM000J, ST16000NM002J, and Toshiba MG09ACA16TE).\u00a0<\/li>\r\n\r\n\r\n\r\n<li><strong>Smaller drives getting older:<\/strong> Perhaps an unsurprising trend\u2014Backblaze\u2019s smaller capacity drives are getting older. We have a total of 13 drive models with 12TB or less, with a collective 1.54% failure rate. See the table below:<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\r\n<p class=\"has-text-align-center has-large-font-size\"><strong>Backblaze drives with \u226412TB capacity<\/strong><\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"5_Less than 12TB\" data-rl_caption=\"5_Less than 12TB\" title=\"5_Less than 12TB\"><img loading=\"lazy\" decoding=\"async\" width=\"2434\" height=\"1008\" class=\"wp-image-112224\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB.png\" alt=\"A image showing drives that are less than or equal to 12TB, including color coding to indicate drive age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB.png 2434w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB-300x124.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB-1024x424.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB-768x318.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB-1536x636.png 1536w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB-2048x848.png 2048w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/5_Less-than-12TB-1568x649.png 1568w\" sizes=\"auto, (max-width: 2434px) 100vw, 2434px\" \/><\/a><\/figure>\r\n<\/div><\/div><\/div>\r\n\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>Of those models, eight are five years old or older (shown in purple). An additional two models are four years or older (that\u2019s your orange). Taking just these 10 models\u2014drives reaching their supposed golden years\u2014we have a collective AFR of 1.42%.<\/p>\r\n\r\n\r\n\r\n<p>Notably, that AFR is due to some well-performing low-failure outliers, including both of the 4TB HGST models (0.57% and 0.40%), the 12TB HGST model HUH721212ALE600 (0.56%), and the 12TB Seagate model ST12000NM001G (0.99%).<\/p>\r\n\r\n\r\n\r\n<p>That said, it\u2019s also perhaps more impressive that when we say \u201ceight are five years and older,\u201d of those eight drive models, five are six or more years old. Their collective AFR is 1.33%.<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"6_Less than 12TB 6 years\" data-rl_caption=\"6_Less than 12TB 6 years\" title=\"6_Less than 12TB 6 years\"><img loading=\"lazy\" decoding=\"async\" width=\"2428\" height=\"516\" class=\"wp-image-112225\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years.png\" alt=\"Drive models that are less than or equal to 12TB and that are 6 or more years old. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years.png 2428w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years-300x64.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years-1024x218.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years-768x163.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years-1536x326.png 1536w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years-2048x435.png 2048w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/6_Less-than-12TB-6-years-1568x333.png 1568w\" sizes=\"auto, (max-width: 2428px) 100vw, 2428px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>This begs the age-old question: Is age just a number? Or, are we just seeing several exceptional drive models? In any event\u2014an interesting drive population to keep an eye on, as it represents 156,724 of our 393,907 (~40%) of the lifetime drive pool.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Zoom in: The 20TB+ club<\/h2>\r\n\r\n\r\n\r\n<p>We\u2019ve been taking quick peeks at the 20TB+ drives in the last few reports, but it\u2019s high time we dig in a bit deeper. Right now, our cohort of 20TB+ drives that meet the lifetime criteria consists of three drives, the 20TB Toshiba model MG10ACA20TE, 22TB WDC model WUH722222ALE6L4, and 24TB Seagate model ST24000NM002H. Quite neatly, that also gives us one per manufacturer, lending itself to something of a head-to-head comparison\u2014though, of course, with the variability we see on a per-drive basis within the same manufacturer, we won\u2019t over-index on lending it too much significance.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>Let\u2019s take a look at each.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">20TB Toshiba MG10ACA20TE<\/h3>\r\n\r\n\r\n\r\n<p>The Toshiba has actually been in our drive pool for 22 months, but until just under a year ago, there were only two drives. For the purposes of significance, then, we\u2019ll exclude significantly low numbers of drives\u2014thankfully, each model has something of a natural fall-off point where they go from single-digit drive numbers to hundreds.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>For the Toshiba, that gives us the following data:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/7_Toshiba.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"7_Toshiba\" data-rl_caption=\"7_Toshiba\" title=\"7_Toshiba\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"311\" class=\"wp-image-112226\" style=\"width: 400px;\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/7_Toshiba.png\" alt=\"A table showing the AFRs for the 20TB Toshiba based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/7_Toshiba.png 1494w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/7_Toshiba-300x233.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/7_Toshiba-1024x795.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/7_Toshiba-768x596.png 768w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>Converted to a graph, we end up with the following:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/8_Toshiba-20TB-1.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"8_Toshiba 20TB 1\" data-rl_caption=\"8_Toshiba 20TB 1\" title=\"8_Toshiba 20TB 1\"><img loading=\"lazy\" decoding=\"async\" width=\"1458\" height=\"928\" class=\"wp-image-112227\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/8_Toshiba-20TB-1.png\" alt=\"A graph showing the failure rates based on age for the 20TB Toshiba drives. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/8_Toshiba-20TB-1.png 1458w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/8_Toshiba-20TB-1-300x191.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/8_Toshiba-20TB-1-1024x652.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/8_Toshiba-20TB-1-768x489.png 768w\" sizes=\"auto, (max-width: 1458px) 100vw, 1458px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>On this graph, the blue line represents the AFR and the red line represents the drive count. Drive count can be a bit tricky since our x-axis is age, and we start with age=0, which means that the drive count (from our perspective) goes from larger to smaller. That is, as drives get older, there are fewer of them by count\u2014you have your initial purchase cohort, then you add drives over time. You can read this as the first data point representing drives that are between 0\u20131 month old, the next data point as 1\u20132 months old, etc.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>We set it up this way because we wanted to be able to directly compare the failure rates of the drives based on their ages. Those familiar with our <a href=\"https:\/\/www.backblaze.com\/blog\/drive-failure-over-time-the-bathtub-curve-is-leaking\/\" target=\"_blank\" rel=\"noreferrer noopener\">bathtub curve analysis<\/a> may recognize our methodology here\u2014we\u2019re just zooming in on specific drives and drive capacities.\u00a0<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">22TB WDC WUH722222ALE6L4<\/h3>\r\n\r\n\r\n\r\n<p>Now let\u2019s take a look at the WDC model. We have usable data for about 21 months of its drive life:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/9_WDC.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"9_WDC\" data-rl_caption=\"9_WDC\" title=\"9_WDC\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"531\" class=\"wp-image-112228\" style=\"width: 400px;\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/9_WDC.png\" alt=\"A table showing the AFRs for the 22TB WDC drives based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/9_WDC.png 1382w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/9_WDC-226x300.png 226w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/9_WDC-772x1024.png 772w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/9_WDC-768x1019.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/9_WDC-1157x1536.png 1157w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>Which gives us the following visualization:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/10_WDC-22TB-1.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"10_WDC 22TB 1\" data-rl_caption=\"10_WDC 22TB 1\" title=\"10_WDC 22TB 1\"><img loading=\"lazy\" decoding=\"async\" width=\"1465\" height=\"928\" class=\"wp-image-112229\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/10_WDC-22TB-1.png\" alt=\"A graph showing the AFRs for the 22TB WDC drives based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/10_WDC-22TB-1.png 1465w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/10_WDC-22TB-1-300x190.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/10_WDC-22TB-1-1024x649.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/10_WDC-22TB-1-768x486.png 768w\" sizes=\"auto, (max-width: 1465px) 100vw, 1465px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>Interestingly, we see a lot less variability in the span of time where we have a direct comparison. That said, the WDC model also had a minimum of double the drive count if we\u2019re looking at a similar time period\u2014so, at their youngest (0 months old) the Toshiba had 14,407 drives vs. WDC\u2019s 37,363; and, at 11 months Toshiba had 1,034 drives vs. WDC\u2019s 13,965.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>While AFRs do get us mostly on an even playing field as far as being able to make a 1:1 comparison, it\u2019s important to remember that in smaller drive pools, a single failure can be amplified by quite a bit.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">24TB Seagate ST24000NM002H<\/h3>\r\n\r\n\r\n\r\n<p>Our youngest drive model, the 24TB Seagate ST24000NM002H, has just half a year of data.<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/11_Seagate.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"11_Seagate\" data-rl_caption=\"11_Seagate\" title=\"11_Seagate\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"199\" class=\"wp-image-112230\" style=\"width: 400px;\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/11_Seagate.png\" alt=\"A table showing the AFRs for the 24TB Seagate drives based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/11_Seagate.png 1450w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/11_Seagate-300x149.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/11_Seagate-1024x508.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/11_Seagate-768x381.png 768w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>That gives us the following visualization:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/12_Seagate-24TB-1.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"12_Seagate 24TB 1\" data-rl_caption=\"12_Seagate 24TB 1\" title=\"12_Seagate 24TB 1\"><img loading=\"lazy\" decoding=\"async\" width=\"1470\" height=\"928\" class=\"wp-image-112231\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/12_Seagate-24TB-1.png\" alt=\"A graph showing the AFRs for the 24TB Seagate drives based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/12_Seagate-24TB-1.png 1470w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/12_Seagate-24TB-1-300x189.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/12_Seagate-24TB-1-1024x646.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/12_Seagate-24TB-1-768x485.png 768w\" sizes=\"auto, (max-width: 1470px) 100vw, 1470px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>Compared with our other two drive models, the 24TB Seagate definitely has the highest failure rates. This could be explained, in part, by it being a young drive\u2014is it in the leading edge of a traditional bathtub curve? So, certainly something to track over time to see if it will settle out as it gets older.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">All together now: Comparing each 20TB+ drives<\/h3>\r\n\r\n\r\n\r\n<p>We designed this view to be directly comparable at points in time, so, here\u2019s your graph that puts each drive on the same time scale:<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"936\" height=\"580\" class=\"wp-image-112245\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/13_20TB-Models-Compared-Fixed.png\" alt=\"A graph showing the trend lines of failure rates vs. age for each of the three 20TB+ models. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/13_20TB-Models-Compared-Fixed.png 936w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/13_20TB-Models-Compared-Fixed-300x186.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/13_20TB-Models-Compared-Fixed-768x476.png 768w\" sizes=\"auto, (max-width: 936px) 100vw, 936px\" \/><\/figure>\r\n\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>What\u2019s our takeaway here? Well, in both drive count and length of time in the pool, it\u2019s a little early to create definitive trends for the Seagate and the Toshiba. Certainly we can see that the Seagate is, early on, showing higher failure rates. Meanwhile, the 20TB Toshiba has had a bit of a variable year one. But again, with significantly variable drive pools between all models, we\u2019re not quite comparing apples to apples. (We chose not to plot drive count on this chart\u2014it gets messy quickly.)\u00a0 Add to that: the Seagate in particular is potentially at the beginning of the \u201cbathtub\u201d curve, we may see it change over time.<\/p>\r\n\r\n\r\n\r\n<p>On the other hand, the 22TB WDC model has shown up quite a bit below our current average AFR for the drive pool of all drive sizes and ages, and it\u2019s the model with the most data. But, how does that compare to other models as they come online?\u00a0<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Comparison: 20TB+ as a pool vs. 14-16TB as a pool<\/h3>\r\n\r\n\r\n\r\n<p>When we were considering whether this information would be a useful slice of the data, our biggest question was how to contextualize it versus drives. It\u2019s perhaps a tad imperfect, but we landed on combining the 14\u201316TB drives as a pool, largely because they have a significant amount of data points and were our last set of drives onboarded, which means that they\u2019re more or less the last generation of hardware.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>The other thing to note is that once we combined the 20TB drives into a pool, some of the data we filtered out on a per-drive basis got added back in. So, at the 21 month mark, where the Toshiba model only had one drive, we added that single drive to the 399 that our WDC model brought to the table and calculated AFR across the pool (giving us 400 drives to work with).\u00a0<\/p>\r\n\r\n\r\n\r\n<p>Here\u2019s the numbers for the 20TB+ drive pool:\u00a0<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/14_Pool-20TB.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"14_Pool 20+TB\" data-rl_caption=\"14_Pool 20+TB\" title=\"14_Pool 20+TB\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"543\" class=\"wp-image-112233\" style=\"width: 400px;\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/14_Pool-20TB.png\" alt=\"A table combining the AFRs for the 20TB+ drives based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/14_Pool-20TB.png 1240w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/14_Pool-20TB-221x300.png 221w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/14_Pool-20TB-754x1024.png 754w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/14_Pool-20TB-768x1043.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/14_Pool-20TB-1131x1536.png 1131w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>That gives us a pretty neat graph, actually:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/15_20TB-Combined-AFR-vs.-Age-1.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"15_20TB+ Combined AFR vs. Age 1\" data-rl_caption=\"15_20TB+ Combined AFR vs. Age 1\" title=\"15_20TB+ Combined AFR vs. Age 1\"><img loading=\"lazy\" decoding=\"async\" width=\"1445\" height=\"928\" class=\"wp-image-112234\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/15_20TB-Combined-AFR-vs.-Age-1.png\" alt=\"A graph combining the AFRs for the 20TB+ drives based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/15_20TB-Combined-AFR-vs.-Age-1.png 1445w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/15_20TB-Combined-AFR-vs.-Age-1-300x193.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/15_20TB-Combined-AFR-vs.-Age-1-1024x658.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/15_20TB-Combined-AFR-vs.-Age-1-768x493.png 768w\" sizes=\"auto, (max-width: 1445px) 100vw, 1445px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>Now, let\u2019s compare to the 14\u201316TB drives of the same age. We have significant data for this population for nearly seven years, but in the interest of saving you three pages of scrolling, I\u2019ll give you the table for the data that directly correlates to the 21 months of data we have for the 20TB+ drives.<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/16_Pool-14-16.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"16_Pool 14-16\" data-rl_caption=\"16_Pool 14-16\" title=\"16_Pool 14-16\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"524\" class=\"wp-image-112235\" style=\"width: 400px;\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/16_Pool-14-16.png\" alt=\"A table combining the AFRs for the 14-16TB drives based on their age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/16_Pool-14-16.png 1308w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/16_Pool-14-16-229x300.png 229w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/16_Pool-14-16-781x1024.png 781w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/16_Pool-14-16-768x1006.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/16_Pool-14-16-1172x1536.png 1172w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>This is the line chart for that range of time:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/17_14-16TB-selected.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"17_14-16TB selected\" data-rl_caption=\"17_14-16TB selected\" title=\"17_14-16TB selected\"><img loading=\"lazy\" decoding=\"async\" width=\"936\" height=\"578\" class=\"wp-image-112237\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/17_14-16TB-selected.png\" alt=\"A graph combining the AFRs for the 14-16TB drives based on their age, showing only the time period from 0-21 months.\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/17_14-16TB-selected.png 936w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/17_14-16TB-selected-300x185.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/17_14-16TB-selected-768x474.png 768w\" sizes=\"auto, (max-width: 936px) 100vw, 936px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>Comparing age of drive to age of drive, it would seem that our 20TB are right on target, and perhaps doing a bit better than expected. But, that definitely isn\u2019t a perfect comparison given that the 14\u201316TB drives have a steadier and larger drive count. So, let\u2019s look at the chart with the full, nearly seven year time period:<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/18_14-16TB-all-time-1.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"18_14-16TB all time\" data-rl_caption=\"18_14-16TB all time\" title=\"18_14-16TB all time\"><img loading=\"lazy\" decoding=\"async\" width=\"936\" height=\"578\" class=\"wp-image-112238\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/18_14-16TB-all-time-1.png\" alt=\"A graph combining the AFRs for the 14-16TB drives based on their age, showing only the full age of the drive pool, 81 months. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/18_14-16TB-all-time-1.png 936w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/18_14-16TB-all-time-1-300x185.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/18_14-16TB-all-time-1-768x474.png 768w\" sizes=\"auto, (max-width: 936px) 100vw, 936px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>This view starts to show us some spiky patterns as the 14\u201316TB drives get older, of course exacerbated by drive counts reducing over time.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">So what\u2019s it all mean?<\/h2>\r\n\r\n\r\n\r\n<p>It\u2019s clear from the data that we need to give the 20TB+ drives time to mature, and that as we (depending on our buying behavior, of course) add more drives, we might see some interesting changes in the data.\u00a0<\/p>\r\n\r\n\r\n\r\n<p>As for the 14\u201316TB pool, they\u2019re following relatively expected patterns of wearing out in the five-plus year range\u2014but what does that mean when you compare to what we observed in our current lifetime stats, where we see our 12TB and smaller drive pool performing so well?\u00a0<\/p>\r\n\r\n\r\n\r\n<p>Without taking a closer look at the 14\u201316TB drives, it\u2019s hard to say that they don\u2019t have similar outlier tendencies to what the 12TB and smaller pool does, just pulling the failure rates upward. Even a casual glance at our current lifetime table\u2019s 14\u201316TB drives bears that out (four years and older highlighted in orange, as our corollary above):\u00a0<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging.png\" data-rel=\"lightbox-gallery-2mutw84Q\" data-rl_title=\"19_Aging\" data-rl_caption=\"19_Aging\" title=\"19_Aging\"><img loading=\"lazy\" decoding=\"async\" width=\"2496\" height=\"906\" class=\"wp-image-112239\" src=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging.png\" alt=\"A image showing drives that are 14-16TB drives, including color coding to indicate drive age. \" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging.png 2496w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging-300x109.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging-1024x372.png 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging-768x279.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging-1536x558.png 1536w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging-2048x743.png 2048w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2025\/08\/19_Aging-1568x569.png 1568w\" sizes=\"auto, (max-width: 2496px) 100vw, 2496px\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n<div class=\"wp-block-spacer\" style=\"height: 10px;\" aria-hidden=\"true\">\u00a0<\/div>\r\n\r\n\r\n\r\n<p>That data isn\u2019t inclusive of all of the 14\u201316TB drives we\u2019ve ever had, though\u2014just those currently in operation. So, as always, there\u2019s more investigation to be done.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">The Hard Drive Stats data<\/h2>\r\n\r\n\r\n\r\n<p>The complete dataset used to create the tables and charts in this report is available on our Hard Drive Test Data page. You can download and use this data for free for your own purpose. All we ask are three things: 1) you cite Backblaze as the source if you use the data, 2) you accept that you are solely responsible for how you use the data, and 3) you do not sell this data itself to anyone; it is free.<\/p>\r\n\r\n\r\n\r\n<p>Good luck, and let us know if you find anything interesting.<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>Read the Q2 2025 Drive Stats report to see the latest annualized failure rates, as well as an in-depth look at the 20TB+ drives currently in the Backblaze drive fleet. <\/p>\n","protected":false},"author":217,"featured_media":112218,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[7,434,438,457],"tags":[468],"class_list":["post-112217","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-storage","category-featured-1","category-featured-cloud-storage","category-hard-drive-stats","tag-b2cloud","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Backblaze Drive Stats for Q2 2025 | Hard Drive Failure Rates<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.backblaze.com\/blog\/backblaze-drive-stats-for-q2-2025\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Backblaze Drive Stats for Q2 2025 | Hard Drive Failure Rates\" \/>\n<meta property=\"og:description\" content=\"Read the Q2 2025 Drive Stats report to see the latest annualized failure rates, as well as an in-depth look at the 20TB+ drives currently in the Backblaze drive fleet.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.backblaze.com\/blog\/backblaze-drive-stats-for-q2-2025\/\" \/>\n<meta property=\"og:site_name\" content=\"Backblaze Blog | Cloud Storage &amp; 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Stephanie Doyle is the Writer and Blog Operations Specialist at Backblaze. She specializes in taking complex topics and writing relatable, engaging, and user-friendly content. You can most often find her reading in public places, and can connect with her on LinkedIn. Pat Patterson is the chief technical evangelist at Backblaze. Over his three decades in the industry, Pat has built software and communities at Sun Microsystems, Salesforce, StreamSets, and Citrix. In his role at Backblaze, he creates and delivers content tailored to the needs of the hands-on technical professional, acts as the \u201cvoice of the developer\u201d on the Product team, and actively participates in the wider technical community. Outside the office, Pat runs far, having completed ultramarathons up to the 50 mile distance. 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