{"id":80687,"date":"2018-02-01T08:57:34","date_gmt":"2018-02-01T16:57:34","guid":{"rendered":"https:\/\/www.backblaze.com\/blog\/?p=80687"},"modified":"2025-12-12T07:40:39","modified_gmt":"2025-12-12T15:40:39","slug":"hard-drive-stats-for-2017","status":"publish","type":"post","link":"https:\/\/www.backblaze.com\/blog\/hard-drive-stats-for-2017\/","title":{"rendered":"Backblaze Hard Drive Stats for 2017"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-80689 size-full\" title=\"Best Hard Drives for Reliability and Performance \" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1.jpg\" alt=\"Backbalze Drive Stats 2017 Review\" width=\"1440\" height=\"820\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1.jpg 1440w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1-300x171.jpg 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1-1024x583.jpg 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1-768x437.jpg 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1-560x319.jpg 560w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1-220x124.jpg 220w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\" \/><\/p>\n<div class=\"abstract\" style=\"text-align: center; margin: 12px auto; padding: 12px 18px;\">For the most recent <span style=\"font-style: italic;\"><a href=\"\/blog\/backblaze-hard-drive-stats-q1-2020\/\">Hard Drive Reliability<\/a> Statistics<\/span>, as well as the raw hard drive test data, visit <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/hard-drive-test-data\" target=\"_blank\" rel=\"noopener noreferrer\">Hard Drive Data and Stats<\/a>.<\/div>\n<p>Beginning in April 2013, Backblaze has recorded and saved daily hard drive statistics from the drives in our data centers. Each entry consists of the date, manufacturer, model, serial number, status (operational or failed), and all of the SMART attributes reported by that drive. As of the end of 2017, there are about 88 million entries totaling 23 GB of data. You can download this data <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/hard-drive-test-data\" target=\"_blank\" rel=\"noopener noreferrer\">from our website<\/a> if you want to do your own research, but for starters here\u2019s what we found.<\/p>\n<h3 class=\"b3\">Overview<\/h3>\n<p>At the end of 2017 we had 93,240 spinning hard drives. Of that number, there were 1,935 boot drives and 91,305 data drives. This post looks at the hard drive statistics of the data drives we monitor. We\u2019ll review the stats for Q4 2017, all of 2017, and the lifetime statistics for all of the drives Backblaze has used in our <a href=\"https:\/\/www.backblaze.com\/cloud-storage\" target=\"_blank\" rel=\"noopener noreferrer\">cloud storage data centers<\/a> since we started keeping track. Along the way we\u2019ll share observations and insights on the data presented and we look forward to you doing the same in the comments.<\/p>\n<h2>Hard Drive Reliability Statistics for Q4 2017<\/h2>\n<p>At the end of Q4 2017 Backblaze was monitoring 91,305 hard drives used to store data. For our evaluation we remove from consideration those drives which were used for testing purposes and those drive models for which we did not have at least 45 drives (read why after the chart). This leaves us with 91,243 hard drives. The table below is for the period of Q4 2017.<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2018\/01\/blog-chart-q4-2017-only.jpeg\" data-rel=\"lightbox-gallery-okmL8cx6\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-80692 size-full\" title=\"\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/01\/blog-chart-q4-2017-only.jpeg\" alt=\"Hard Drive Annualized Failure Rates for Q4 2017\" width=\"621\" height=\"642\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-chart-q4-2017-only.jpeg 621w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-chart-q4-2017-only-290x300.jpeg 290w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-chart-q4-2017-only-560x579.jpeg 560w\" sizes=\"auto, (max-width: 621px) 100vw, 621px\" \/><\/a><\/p>\n<h4 class=\"b4\">A few things to remember when viewing this chart:<\/h4>\n<ul>\n<li>The failure rate listed is for just Q4 2017. If a drive model has a failure rate of 0%, it means there were no drive failures of that model during Q4 2017.<\/li>\n<li>There were 62 drives (91,305 minus 91,243) that were not included in the list above because we did not have at least 45 of a given drive model. The most common reason we would have fewer than 45 drives of one model is that we needed to replace a failed drive and we had to purchase a different model as a replacement because the original model was no longer available. We use 45 drives of the same model as the minimum number to qualify for reporting quarterly, yearly, and lifetime <a href=\"\/blog\/backblaze-hard-drive-stats-for-2020\/\">drive statistics<\/a>.<\/li>\n<li>Quarterly failure rates can be volatile, especially for models that have a small number of drives and\/or a small number of drive days. For example, the Seagate 4 TB drive, model ST4000DM005, has a annualized failure rate of 29.08%, but that is based on only 1,255 drive days and 1 (one) <a href=\"\/blog\/managing-for-hard-drive-failures-data-corruption\/\">drive failure<\/a>.<\/li>\n<li>AFR stands for Annualized Failure Rate, which is the projected failure rate for a year based on the data from this quarter only.<\/li>\n<\/ul>\n<h3 class=\"b3\">Bulking Up and Adding On Storage<\/h3>\n<p>Looking back over 2017, we not only added new drives, we \u201cbulked up\u201d by swapping out functional and smaller 2, 3, and 4TB drives with larger 8, 10, and 12TB drives. The changes in drive quantity by quarter are shown in the chart below:<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2018\/01\/blog-2017-drive-counts.jpeg\" data-rel=\"lightbox-gallery-okmL8cx6\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-80690\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/01\/blog-2017-drive-counts.jpeg\" alt=\"Backblaze Drive Population by Drive Size\" width=\"748\" height=\"602\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-2017-drive-counts.jpeg 748w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-2017-drive-counts-300x241.jpeg 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-2017-drive-counts-560x451.jpeg 560w\" sizes=\"auto, (max-width: 748px) 100vw, 748px\" \/><\/a><\/p>\n<p>For 2017 we added 25,746 new drives, and lost 6,442 drives to retirement for a net of 19,304 drives. When you look at storage space, we added 230 <a href=\"\/blog\/150-petabytes-of-cloud-storage\/\">petabytes<\/a> and retired 19 petabytes, netting us an additional 211 petabytes of storage in our data center in 2017.<\/p>\n<h2 class=\"b2\">2017 <a href=\"\/blog\/managing-for-hard-drive-failures-data-corruption\/\">Hard Drive Failure<\/a> Stats<\/h2>\n<p>Below are the lifetime <a href=\"\/blog\/managing-for-hard-drive-failures-data-corruption\/\">hard drive failure<\/a> statistics for the hard drive models that were operational at the end of Q4 2017. As with the quarterly results above, we have removed any non-production drives and any models that had fewer than 45 drives.<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2018\/01\/blog-chart-lifetime-stats-2017.jpeg\" data-rel=\"lightbox-gallery-okmL8cx6\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-80691 size-full\" title=\"\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/01\/blog-chart-lifetime-stats-2017.jpeg\" alt=\"Hard Drive Annualized Failure Rates\" width=\"725\" height=\"621\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-chart-lifetime-stats-2017.jpeg 725w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-chart-lifetime-stats-2017-300x257.jpeg 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-chart-lifetime-stats-2017-560x480.jpeg 560w\" sizes=\"auto, (max-width: 725px) 100vw, 725px\" \/><\/a><\/p>\n<p>The chart above gives us the lifetime view of the various drive models in our data center. The Q4 2017 chart at the beginning of the post gives us a snapshot of the most recent quarter of the same models.<\/p>\n<p>Let\u2019s take a look at the same models over time, in our case over the past 3 years (2015 through 2017), by looking at the annual failure rates for each of those years.<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2018\/01\/blog-table-3-years.jpeg\" data-rel=\"lightbox-gallery-okmL8cx6\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-80688 size-full\" title=\"\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/01\/blog-table-3-years.jpeg\" alt=\"Annual Hard Drive Failure Rates by Year\" width=\"721\" height=\"672\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-table-3-years.jpeg 721w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-table-3-years-300x280.jpeg 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-table-3-years-560x522.jpeg 560w\" sizes=\"auto, (max-width: 721px) 100vw, 721px\" \/><\/a><\/p>\n<p>The failure rate for each year is calculated for just that year. In looking at the results the following observations can be made:<\/p>\n<ul>\n<li>The failure rates for both of the <a href=\"\/blog\/6-tb-hard-drive-face-off\/\">6 TB<\/a> models, Seagate and WDC, have decreased over the years while the number of drives has stayed fairly consistent from year to year.<\/li>\n<li>While it looks like the failure rates for the 3 TB WDC drives have also decreased, you\u2019ll notice that we migrated out nearly 1,000 of these WDC drives in 2017. While the remaining 180 WDC 3 TB drives are performing very well, decreasing the data set that dramatically makes trend analysis suspect.<\/li>\n<li>The Toshiba 5 TB model and the HGST 8 TB model had zero failures over the last year. That&#8217;s impressive, but with only 45 drives in use for each model, not statistically useful.<\/li>\n<li>The HGST\/Hitachi 4 TB models delivered sub 1.0% failure rates for each of the three years. Amazing.<\/li>\n<\/ul>\n<h3 class=\"b3\">A Few More Numbers<\/h3>\n<p>To save you countless hours of looking, we&#8217;ve culled through the data to uncover the following tidbits regarding our ever changing <a href=\"\/blog\/life-and-times-of-a-backblaze-hard-drive\/\">hard drive<\/a> farm.<\/p>\n<ul>\n<li><strong>116,833<\/strong> \u2014 The number of hard drives for which we have data from April 2013 through the end of December 2017. Currently there are 91,305 drives (data drives) in operation. This means 25,528 drives have either failed or been removed from service due for some other reason \u2014 typically migration.<\/li>\n<li><strong>29,844<\/strong> \u2014 The number of hard drives that were installed in 2017. This includes new drives, migrations, and failure replacements.<\/li>\n<li><strong>81.76<\/strong> \u2014 The number of hard drives that were installed each day in 2017. This includes new drives, migrations, and failure replacements.<\/li>\n<li><strong>95,638<\/strong> \u2014 The number of drives installed since we started keeping records in April 2013 through the end of December 2017.<\/li>\n<li><strong>55.41<\/strong> \u2014 The average number of hard drives installed per day from April 2013 to the end of December 2017. The installations can be new drives, migration replacements, or failure replacements.<\/li>\n<li><strong>1,508<\/strong> \u2014 The number of hard drives that were replaced as failed in 2017.<\/li>\n<li><strong>4.13<\/strong> \u2014 The average number of hard drives that have failed each day in 2017.<\/li>\n<li><strong>6,795<\/strong> \u2014 The number of hard drives that have failed from April 2013 until the end of December 2017.<\/li>\n<li><strong>3.94<\/strong> \u2014 The average number of hard drives that have failed each day from April 2013 until the end of December 2017.<\/li>\n<\/ul>\n<h3 class=\"b3\">Can\u2019t Get Enough Hard Drive Stats?<\/h3>\n<p>We\u2019ll be presenting the webinar \u201c<a href=\"https:\/\/www.brighttalk.com\/webcast\/14807\/300531?utm_source=Backblaze-blog&amp;utm_medium=brighttalk&amp;utm_campaign=300531\" target=\"_blank\" rel=\"noopener noreferrer\">Backblaze Hard Drive Stats for 2017<\/a>\u201d on Thursday February 9, 2018 at 10:00 Pacific time. The webinar will dig deeper into the quarterly, yearly, and lifetime hard <a href=\"\/blog\/backblaze-hard-drive-stats-q3-2019\/\">drive stats<\/a> and include the annual and lifetime stats by drive size and manufacturer. You will need to subscribe to the Backblaze BrightTALK channel to view the webinar. <a href=\"https:\/\/www.brighttalk.com\/webcast\/14807\/300531?utm_source=Backblaze-blog&amp;utm_medium=brighttalk&amp;utm_campaign=300531\" target=\"_blank\" rel=\"noopener noreferrer\">Sign up today<\/a>.<\/p>\n<p>As a reminder, the complete data set used to create the information used in this review is available on our <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/hard-drive-test-data\" target=\"_blank\" rel=\"noopener noreferrer\">Hard Drive Test Data page<\/a>. 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 to anyone \u2014 it is free.<\/p>\n<p>Good luck and let us know if you find anything interesting.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Starting in 2013, Backblaze has recorded and saved daily statistics from all the hard drives in our data centers.  As of the end of 2017, we had 93,240 spinning hard drives and 88 million statistical records totaling 23 GB of data. Here is the summary of our findings for 2017 based on that data.<\/p>\n","protected":false},"author":12,"featured_media":80689,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[7,457],"tags":[468],"class_list":["post-80687","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-storage","category-hard-drive-stats","tag-b2cloud","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hard Drive Failure Rates: The Official Backblaze Drive Stats for 2017<\/title>\n<meta name=\"description\" content=\"Since 2013, Backblaze has been showcasing daily statistics from our hard drives. Find out how our drives have been doing throughout 2017 with this blog post.\" \/>\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\/hard-drive-stats-for-2017\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hard Drive Failure Rates: The Official Backblaze Drive Stats for 2017\" \/>\n<meta property=\"og:description\" content=\"Since 2013, Backblaze has been showcasing daily statistics from our hard drives. Find out how our drives have been doing throughout 2017 with this blog post.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.backblaze.com\/blog\/hard-drive-stats-for-2017\/\" \/>\n<meta property=\"og:site_name\" content=\"Backblaze Blog | Cloud Storage &amp; Cloud Backup\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/backblaze\" \/>\n<meta property=\"article:published_time\" content=\"2018-02-01T16:57:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-12T15:40:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/01\/blog-header-hard-drive-stats-2017-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1440\" \/>\n\t<meta property=\"og:image:height\" content=\"820\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Andy Klein\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@backblaze\" \/>\n<meta name=\"twitter:site\" content=\"@backblaze\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Andy Klein\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Hard Drive Failure Rates: The Official Backblaze Drive Stats for 2017","description":"Since 2013, Backblaze has been showcasing daily statistics from our hard drives. 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He has over 25 years of experience in technology marketing and during that time, he has shared his expertise in cloud storage and computer security at events, symposiums, and panels at RSA, SNIA SDC, MIT, the Federal Trade Commission, and hundreds more. 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