{"id":43331,"date":"2015-10-14T09:29:02","date_gmt":"2015-10-14T16:29:02","guid":{"rendered":"https:\/\/www.backblaze.com\/blog\/?p=43331"},"modified":"2025-12-14T16:03:07","modified_gmt":"2025-12-15T00:03:07","slug":"hard-drive-reliability-q3-2015","status":"publish","type":"post","link":"https:\/\/www.backblaze.com\/blog\/hard-drive-reliability-q3-2015\/","title":{"rendered":"What Can 49,056 Hard Drives Tell Us? Hard Drive Reliability Stats for Q3 2015"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43321\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2015\/10\/hard-drive-reliability-stats-q3-2015.jpg\" alt=\"Q3 2015 Hard Drive Reliability Stats\" width=\"720\" height=\"405\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/hard-drive-reliability-stats-q3-2015.jpg 720w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/hard-drive-reliability-stats-q3-2015-300x169.jpg 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/hard-drive-reliability-stats-q3-2015-560x315.jpg 560w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/hard-drive-reliability-stats-q3-2015-220x124.jpg 220w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/p>\n<div class=\"abstract\" style=\"text-align: center; margin: 12px auto; padding: 12px 18px;\">For the most recent <a href=\"\/blog\/helium-filled-hard-drive-failure-rates\/\">hard drive reliability<\/a> statistics, 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 id=\"bzdropcap\">As of the end of Q3 2015, there were 50,228 drives spinning in the Backblaze data center. Subtracting boot drives, drive models with less than 45 drives and drives in testing systems, we are publishing data on 49,056 hard drives spread across 26 different models, varying from 1TB to 8TB in size.<\/p>\n<h2>What\u2019s New for the Q3 2015 Results?<\/h2>\n<p>In this edition, we are publishing the data on our 1TB drives for the first time. The data was always available in the data files we publish on our <a href=\"\/blog\/life-and-times-of-a-backblaze-hard-drive\/\">Hard Drive<\/a> Data webpage, but now we\u2019re reporting the data here too. We are also going to include \u201cAverage Drive Age\u201d for each model and we\u2019ll summarize the data by manufacturer size as well.<\/p>\n<h2><a href=\"\/blog\/managing-for-hard-drive-failures-data-corruption\/\">Hard Drive Failure<\/a> Rates<\/h2>\n<p>Let\u2019s start by breaking down the drives by size and comparing them over time:<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2015\/10\/blog-q3-stats-table.png\" target=\"_blank\" rel=\"noopener noreferrer\" data-rel=\"lightbox-gallery-Rhu5NH3i\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43451\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2015\/10\/blog-q3-stats-table.png\" alt=\"blog-q3-stats-table\" width=\"681\" height=\"1270\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/blog-q3-stats-table.png 681w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/blog-q3-stats-table-161x300.png 161w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/blog-q3-stats-table-549x1024.png 549w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/blog-q3-stats-table-560x1044.png 560w\" sizes=\"auto, (max-width: 681px) 100vw, 681px\" \/><\/a><br \/>\nThere\u2019s a lot going on in the chart above; here are a few things to help out:<\/p>\n<ul>\n<li>The 2013, 2014, and 2015 failure rates are cumulative for the given year. In the case of 2015 that is through Q3 (September).<\/li>\n<li>If the failure rate is listed as 0.00% there were drives in use, but none of the drives failed during that period.<\/li>\n<li>If the failure rate is blank, there were no drives in use during that period.<\/li>\n<li>The \u201cAll Periods\u201d failure rates are cumulative for all data (2013-Q3 2015).<\/li>\n<li>The \u201cMax # in Service\u201d column is the maximum number of drives ever in service for the given hard drive model.<\/li>\n<li>The \u201cAvg Age (Months)\u201d column is the average age of all the hard drives of the given hard drive model. This is based on SMART 9 data.<\/li>\n<li>If the \u201cAvg Age (Months)\u201d data is 0.0, the given drive model was not in service during 2015 making the value difficult to <a href=\"https:\/\/www.backblaze.com\/b2\/solutions\/compute.html\">compute.<\/a> (We\u2019ll try to figure out a better way to compute this value by the next report.)<\/li>\n<li>The HGST (*) model name\u2014we\u2019ve been asked to use HGST in place of Hitachi and we are honoring that request, but these drives report their model as Hitachi and are listed as such in the data files.<\/li>\n<li>The Low Rate and High Rate are the boundaries for the confidence interval for the failure rate listed.<\/li>\n<\/ul>\n<p>If the chart is too much data all at once, you can <a href=\"https:\/\/f001.backblaze.com\/file\/Backblaze_Blog\/q3-2015-hard-drive-table-Backblaze.zip\" target=\"_blank\" rel=\"noopener noreferrer\">download a ZIP file<\/a> that when unzipped contains a Microsoft Excel file of the data from the chart. Then you can parse the facts and figures at your leisure.<\/p>\n<h3>Some Observations Based on This Data<\/h3>\n<ul>\n<li>In the chart below are the failure stats for all of the drives in the review, broken down by year. We\u2019ve also computed the average failure rate for all periods for all drives at 4.81%.<\/li>\n<\/ul>\n<p><a href=\"\/blog\/wp-content\/uploads\/2015\/10\/blog_q3stats_total_avg-e1444679877857.jpg\" target=\"_blank\" rel=\"noopener noreferrer\" data-rel=\"lightbox-gallery-Rhu5NH3i\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43391\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2015\/10\/blog_q3stats_total_avg-e1444679877857.jpg\" alt=\"blog_q3stats_total_avg\" width=\"699\" height=\"725\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/blog_q3stats_total_avg-e1444679877857.jpg 699w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/blog_q3stats_total_avg-e1444679877857-289x300.jpg 289w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/blog_q3stats_total_avg-e1444679877857-560x581.jpg 560w\" sizes=\"auto, (max-width: 699px) 100vw, 699px\" \/><\/a><\/p>\n<ul>\n<li>The Western Digital 1TB drives in use are nearly six years old on average. There are several drives with nearly seven years of service. It wasn\u2019t until 2015 that the failure rate rose above the annual average for all drives. This makes sense given the \u201cbathtub\u201d curve of <a href=\"\/blog\/managing-for-hard-drive-failures-data-corruption\/\">drive failure<\/a> where drives over four years start to fail at a higher rate. Still, the WD 1TB drives have performed well for a long time.<\/li>\n<li>Nearly all of the 1TB and 1.5TB drives were installed in Storage Pod 1.0 chassis. Yet, these two sizes have very different failure rates.<\/li>\n<li>Nearly all of the 2TB and 3TB drives were installed in 2.0 chassis. Yet, these two drive sizes have very different failure rates.<\/li>\n<li>Always consider the number of drives (Max # in Service) when looking at the failure rate. For example, the 1.5TB Seagate Barracuda Green drive has a failure rate of 130.9%, but that is based on only 51 drives. We tested these Seagate drives in one Storage Pod in our environment and they were not a good fit. In general, we\u2019ve found it takes at least six Storage Pods (270 drives) worth of drives to get good sense of how a given drive will perform in our environment.<\/li>\n<li>4TB drives, regardless of their manufacturer, are performing well. The 2.10% overall failure rate means that over the course of a year, we have to replace only one drive in a <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/storage-pod\">Storage Pod<\/a> filled with these drives. In other words, on average, a Pod comes down for maintenance once a year due to drive failure. The math: 2% is one out of 50. There are 45 drives in a Pod, so about once a year, one of those 45 drives, on average, will fail. Yes, the math is approximate, but you get the idea.<\/li>\n<li>6TB drives, especially the Seagate drives, are also performing well, on par with the 4TB drives so far. The 6TB drives give us 270TB Storage Pods, giving us 50% more storage at the same overall cost per gigabyte.<\/li>\n<li>The 5TB and 8TB drives are performing well, but we only have 45 of each in testing, not enough to feel confident in the numbers yet as can be seen in the confidence interval (low rate\/high rate) of these drives.<\/li>\n<\/ul>\n<h2>Drive Failures by Manufacturer<\/h2>\n<p>Below is the chart of failure percentages by manufacturer. This is for all the drives in this analysis for the years noted:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2015\/10\/blog_q3stats_manufacturer-e1444680042365.jpg\" alt=\"hard drive reliability by manufacturer\" \/><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>Embed this graph on your site<\/ul>\n<\/li>\n<\/ul>\n<p><textarea cols=\"70\" readonly=\"readonly\" rows=\"4\">&lt;img src=&#8221;https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2015\/10\/blog_q3stats_manufacturer-e1444680042365.jpg&#8221; alt=&#8221;hard drive reliability by manufacturer&#8221;\/&gt;&lt;a href=&#8221;https:\/\/www.backblaze.com\/blog\/hard-drive-reliability-q3-2015\/&#8221;&gt;Statistics Based on 49,056 Hard Drives&lt;\/a&gt;<\/textarea><\/p>\n<h2>Our Environment<\/h2>\n<p>All the hard drives in this review are used in the production systems in our data center. The environment is climate controlled and all drives are individually monitored. Each day we pull the available SMART stats reported by each and every drive. These stats are available for download from our <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/hard-drive-test-data\" target=\"_blank\" rel=\"noopener noreferrer\">Hard Drive Data<\/a> webpage. Those stats form the basis for this blog post. The large data files make for large data sets to work on, but if you give it a try, please let us know if you find anything interesting.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>As of the end of Q3 2015, there were 50,228 drives spinning in the Backblaze datacenter. Subtracting boot drives, drive models with less than 45 drives and drives in testing systems, we are publishing data on 49,056 hard drives spread across 26 different models, varying from 1.0TB to 8.0TB in size.<\/p>\n","protected":false},"author":12,"featured_media":43321,"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-43331","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 v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Backblaze Drive Stats for Q3 2015 | Hard Drive Failure Rates<\/title>\n<meta name=\"description\" content=\"We analyze the performance of 49,056 hard drives running everyday in our data center. Discover the best performing individual models and overall trends.\" \/>\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-reliability-q3-2015\/\" \/>\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 Q3 2015 | Hard Drive Failure Rates\" \/>\n<meta property=\"og:description\" content=\"We analyze the performance of 49,056 hard drives running everyday in our data center. Discover the best performing individual models and overall trends.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.backblaze.com\/blog\/hard-drive-reliability-q3-2015\/\" \/>\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=\"2015-10-14T16:29:02+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-15T00:03:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2015\/10\/hard-drive-reliability-stats-q3-2015.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"720\" \/>\n\t<meta property=\"og:image:height\" content=\"405\" \/>\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=\"6 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Backblaze Drive Stats for Q3 2015 | Hard Drive Failure Rates","description":"We analyze the performance of 49,056 hard drives running everyday in our data center. 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