{"id":38008,"date":"2016-09-28T11:42:18","date_gmt":"2016-09-28T16:42:18","guid":{"rendered":"https:\/\/eshop.macsales.com\/blog\/?p=38008"},"modified":"2017-06-21T17:16:10","modified_gmt":"2017-06-21T22:16:10","slug":"rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks","status":"publish","type":"post","link":"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/","title":{"rendered":"How to Use macOS Sierra Disk Utility to Verify or Repair Disks"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-38024 alignright\" src=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/DiskUtilityIcon-e1475079522192.jpg\" alt=\"diskutilityicon\" width=\"240\" height=\"240\" srcset=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/DiskUtilityIcon-e1475079522192-120x120@2x.png 240w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/DiskUtilityIcon-e1475079522192-120x120.png 120w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/DiskUtilityIcon-e1475079522192-190x190.png 190w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/>One of the old Mac OS X utilities, Disk Utility, has received a makeover in macOS Sierra. The updated app now presents a streamlined\u00a0appearance\u00a0while retaining all of its former functionality, and it&#8217;s still useful for verifying or repairing disks. This can be useful if you&#8217;re running into odd issues\u00a0with a Mac, so we&#8217;ll take a look at the process of verifying and repairing disks with macOS Sierra&#8217;s Disk Utility.<\/p>\n<p>Some of the issues you might encounter that indicate a disk that might need repair:<\/p>\n<ul>\n<li>Multiple apps quit unexpectedly<\/li>\n<li>A file is corrupted<\/li>\n<li>An external device doesn&#8217;t work properly<\/li>\n<li>Your Mac refuses to start up<\/li>\n<\/ul>\n<p><strong>Verifying Disks<\/strong><br \/>\nVerifying a disk subjects it to a series of checks, all of which are done through a process called &#8220;Live Verification&#8221;. This means that Disk Utility can check the status of a disk, its catalog file, multi-linked files, catalog hierarchy and more the Mac\u00a0needing to be started up with another disk drive. It does this by &#8220;freezing&#8221; the volume, so while you&#8217;re running the verification tests you may find that your Mac becomes slow or unresponsive.<\/p>\n<p>To verify a disk, simply launch Disk Utility (found in Applications &gt; Utilities), click on the drive volume you wish to check, then click on the First Aid button in the Disk Utility toolbar. Disk Utility responds by stating what it&#8217;s about to do:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38018\" src=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.02.58-AM.jpg\" alt=\"screen-shot-2016-09-28-at-9-02-58-am\" width=\"420\" height=\"130\" srcset=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.02.58-AM.jpg 420w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.02.58-AM-284x88.png 284w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.02.58-AM-190x59.png 190w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.02.58-AM-190x59@2x.png 380w\" sizes=\"auto, (max-width: 420px) 100vw, 420px\" \/>Click the blue Run button to begin the process of verifying the disk. Disk Utility informs you of what&#8217;s about to happen, specifically noting that apps will become unresponsive during the tests.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38020\" src=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.03.26-AM.jpg\" alt=\"screen-shot-2016-09-28-at-9-03-26-am\" width=\"417\" height=\"191\" srcset=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.03.26-AM.jpg 417w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.03.26-AM-262x120.png 262w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.03.26-AM-284x130.png 284w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.03.26-AM-190x87.png 190w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.03.26-AM-190x87@2x.png 380w\" sizes=\"auto, (max-width: 417px) 100vw, 417px\" \/><\/p>\n<p>Click the blue Continue button, and Disk Utility begins to perform its battery of tests on the hard drive. The process usually runs quickly, taking only a few minutes to verify a large (2 TB) boot drive.\u00a0You&#8217;ll get a notification that the First Aid process is complete (see image below), with either a green check mark indicating that everything appears to be OK or a red X indicating that there are some issues that need to be repaired. To repair a disk, it&#8217;s necessary to boot from another drive, then run Disk Utility again. We&#8217;ll cover that in the next section of this post.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38021\" src=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.05.06-AM.jpg\" alt=\"screen-shot-2016-09-28-at-9-05-06-am\" width=\"421\" height=\"327\" srcset=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.05.06-AM.jpg 421w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.05.06-AM-154x120.png 154w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.05.06-AM-284x221.png 284w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.05.06-AM-190x148.png 190w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.05.06-AM-154x120@2x.png 308w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/Screen-Shot-2016-09-28-at-9.05.06-AM-190x148@2x.png 380w\" sizes=\"auto, (max-width: 421px) 100vw, 421px\" \/><\/p>\n<p>Note that the Live Verification process only works on volumes that have been formatted as &#8220;Mac OS Extended (Journaled)&#8221;. If you run First Aid on a volume that is not journaled, Disk Utility responds with an error message saying &#8220;ERROR: could not freeze volume (Operation not supported). In addition, you may not be able to interrupt\u00a0the Live Verification through First Aid, so it&#8217;s best to let it continue to run until completed. Finally, an alert message that says &#8220;Incorrect size for file temp&#8221; is no cause for alarm.<\/p>\n<p><strong>Repairing a\u00a0Disk<\/strong><br \/>\nIf First Aid and the Live Verification process indicate that repairs are required on a volume, it&#8217;s time to boot from another disk drive and then run Disk Utility again. Fortunately for Mac users, there&#8217;s a built-in &#8220;boot disk&#8221; in the guise of the Recovery Partition.<\/p>\n<p>To boot from the Recovery Partition, restart your Mac and hold down the Option key. When the Mac restarts, you are\u00a0greeted by icons for all of the available drives. In the example below, there&#8217;s a Sierra drive, a Windows drive (Boot Camp), and a drive designated &#8220;Recovery-10.12&#8221;. macOS Sierra is also known as macOS 10.12, so this is the Recovery Partition for our Sierra boot drive.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38022\" src=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078.jpg\" alt=\"img_0078\" width=\"640\" height=\"480\" srcset=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078.jpg 640w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078-160x120.jpg 160w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078-284x213.jpg 284w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078-190x143.jpg 190w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078-160x120@2x.jpg 320w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078-284x213@2x.jpg 568w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0078-190x143@2x.jpg 380w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/p>\n<p>Use your mouse, trackpad, or keyboard arrow keys to highlight the &#8220;Recovery-10.12&#8221; drive, then press Return. Once the system has booted, four macOS Utilities are listed, one of which is Disk Utility (see image below). Click Disk Utility to select it, then click the Continue button. The familiar Disk Utility window appears. Click on the drive requiring repairs, then click First Aid again. As before, Disk Utility will take the volume through the Live Verification process. When it finds errors on that volume, it can now repair them since you&#8217;ve booted from another disk.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38023\" src=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079.jpg\" alt=\"img_0079\" width=\"569\" height=\"390\" srcset=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079.jpg 569w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079-175x120.jpg 175w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079-284x195.jpg 284w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079-190x130.jpg 190w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079-175x120@2x.jpg 350w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079-284x195@2x.jpg 568w, https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/IMG_0079-190x130@2x.jpg 380w\" sizes=\"auto, (max-width: 569px) 100vw, 569px\" \/><\/p>\n<p>Should you require additional detail not found in this post, be sure to check these two Apple knowledge base articles:<\/p>\n<ul>\n<li><a href=\"https:\/\/support.apple.com\/kb\/PH22245?locale=en_US&amp;viewlocale=en_US\" target=\"_blank\">Disk Utility for Mac: Verify a disk using Disk Utility<\/a><\/li>\n<li><a href=\"https:\/\/support.apple.com\/kb\/PH22243?locale=en_US\" target=\"_blank\">Disk Utility for Mac: Repair a disk using Disk Utility<\/a><\/li>\n<\/ul>\n<p><strong>Further reading\u00a0on macOS Sierra:<\/strong><\/p>\n<ul>\n<li><a title=\"How To Get Ready For macOS Sierra\" href=\"https:\/\/eshop.macsales.com\/blog\/37969-how-to-get-ready-for-macos-sierra\" target=\"_blank\" rel=\"bookmark\">How To Get Ready For macOS Sierra<\/a><\/li>\n<li><a title=\"Create a Bootable macOS Sierra Install Drive with DiskMaker X\" href=\"https:\/\/eshop.macsales.com\/blog\/37977-create-a-bootable-macos-sierra-install-drive\" target=\"_blank\" rel=\"bookmark\">Create a Bootable macOS Sierra Install Drive with DiskMaker X<\/a><\/li>\n<li><a title=\"macOS Sierra Preview: Using Siri on the Mac\" href=\"https:\/\/eshop.macsales.com\/blog\/37550-macos-sierra-preview-using-siri-on-the-mac\" target=\"_blank\" rel=\"bookmark\">macOS Sierra Preview: Using Siri on the Mac<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>One of the old Mac OS X utilities, Disk Utility, has received a makeover in macOS Sierra. The updated app now presents a streamlined\u00a0appearance\u00a0while retaining all of its former functionality, and it&#8217;s still useful for verifying or repairing disks. This can be useful if you&#8217;re running into odd issues\u00a0with a Mac, so we&#8217;ll take a [&hellip;]<\/p>\n","protected":false},"author":81,"featured_media":38028,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":"","footnotes":""},"categories":[4],"class_list":["post-38008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech-tips"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.2 (Yoast SEO v20.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Use macOS Sierra Disk Utility to Verify or Repair Disks<\/title>\n<meta name=\"description\" content=\"One of the old Mac OS X utilities, Disk Utility, has received a makeover in macOS Sierra. The updated app now presents a streamlined\u00a0appearance\u00a0while\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Use macOS Sierra Disk Utility to Verify or Repair Disks\" \/>\n<meta property=\"og:description\" content=\"One of the old Mac OS X utilities, Disk Utility, has received a makeover in macOS Sierra. The updated app now presents a streamlined\u00a0appearance\u00a0while\" \/>\n<meta property=\"og:url\" content=\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/\" \/>\n<meta property=\"og:site_name\" content=\"Rocket Yard\" \/>\n<meta property=\"article:author\" content=\"https:\/\/facebook.com\/stevensande\" \/>\n<meta property=\"article:published_time\" content=\"2016-09-28T16:42:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-06-21T22:16:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/eshop.macsales.com\/blog\/wp-content\/uploads\/2016\/09\/DiskUtilityIcon-e1475079522192-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"240\" \/>\n\t<meta property=\"og:image:height\" content=\"240\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Steve Sande\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Steve Sande\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/\"},\"author\":{\"name\":\"Steve Sande\",\"@id\":\"https:\/\/eshop.macsales.com\/blog\/#\/schema\/person\/1152721d0acb70692858d0f3fcb12e7a\"},\"headline\":\"How to Use macOS Sierra Disk Utility to Verify or Repair Disks\",\"datePublished\":\"2016-09-28T16:42:18+00:00\",\"dateModified\":\"2017-06-21T22:16:10+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/\"},\"wordCount\":762,\"commentCount\":11,\"publisher\":{\"@id\":\"https:\/\/eshop.macsales.com\/blog\/#organization\"},\"keywords\":[\"Disk Utility\",\"First Aid\",\"Live Verification\",\"macOS Sierra\",\"Recovery Partition\"],\"articleSection\":[\"Tech Tips\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/\",\"url\":\"https:\/\/eshop.macsales.com\/blog\/38008-rocket-yard-guide-using-macos-sierra-disk-utility-to-verify-or-repair-disks\/\",\"name\":\"How to Use macOS Sierra Disk Utility to Verify or Repair Disks\",\"isPartOf\":{\"@id\":\"https:\/\/eshop.macsales.com\/blog\/#website\"},\"datePublished\":\"2016-09-28T16:42:18+00:00\",\"dateModified\":\"2017-06-21T22:16:10+00:00\",\"description\":\"One of the old Mac OS X utilities, Disk Utility, has received a makeover in macOS Sierra. 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