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Disk Utility is a system utility for performing disk and disk volume-related tasks on the macOSoperating system by Apple Inc.
Functions[edit]
The functions currently supported by Disk Utility include:[1]
Creation, conversion, backup, compression and encryption of logical volume images from a wide range of formats read by Disk Utility to .dmg or, for CD/DVD images, .cdr
Mounting, unmounting and ejecting disk volumes (including both hard disks, removable media and disk volume images)
Enabling or disabling journaling
Verifying a disk's integrity, and repairing it if the disk is damaged (this will work for both Mac compatible format partitions, and FAT32 partitions with Microsoft Windows installed)
Erasing, formatting, partitioning[2] and cloning disks
Secure deletion of free space or disk using a 'zero out' data, a 7-pass DOD 5220-22 M standard, or a 35-pass Gutmann algorithm
Adding or changing partition table between Apple Partition Map, GUID Partition Table and master boot record (MBR)
Restoring volumes from Apple Software Restore (ASR) images
Checking the S.M.A.R.T. status of a hard disk
Disk Utility functions may also be accessed from the macOS command line with the diskutil and hdiutil commands.[3]
History[edit]
In the classic Mac OS, similar functionality to the verification features of Disk Utility could be found in the Disk First Aid application. Another application called Drive Setup was used for drive formatting and partitioning and the application Disk Copy was used for working with disk images.
Before Mac OS X Panther, the functionality of Disk Utility was spread across two applications: Disk Copy and Disk Utility. Disk Copy was used for creating and mounting disk image files whereas Disk Utility was used for formatting, partitioning, verifying and repairing file structures. The ability to 'zero' all data (multi-pass formatting) on a disk was not added until Mac OS X 10.2.3.[4] Further changes introduced in Mac OS X Tiger, specifically version 10.4.3, allowed Disk Utility to be used to verify the file structure of the current boot drive. Mac OS X Leopard added the ability to create, resize and delete disk partitions without erasing them, a feature known as live partitioning. In OS X El Capitan, Disk Utility has a different user interface and lost the ability to repair permissions due to obsolescence,[5] create and manage disks formatted as RAID, burn discs and multi-pass format internal solid-state drives and encrypted external drives.[6]
See also[edit]
References[edit]
^'Disk Utility 10.5 Help: Testing and repairing a disk or volume'. Apple Inc.
^'Mac OS X 10.5: About resizing disk partitions'. Apple Inc.
^Landau, Ted; Frakes, Dan (December 20, 2005). Mac OS X Help Line, Tiger Edition. Peachpit Press. ISBN9780132705240.
^'Mac OS X: About the Mac OS X 10.2.3 Update'Archived March 27, 2008, at the Wayback Machine. Apple Inc.
^'OS X v10.11 Developer Beta 7 Release Notes'. Mac Developer Library. Apple Inc. August 18, 2015. Retrieved October 7, 2015.[permanent dead link]
^Cunningham, Andrew; Hutchinson, Lee (September 29, 2015). 'OS X 10.11 El Capitan: The Ars Technica Review'. Ars Technica. Retrieved September 30, 2015.
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Disk_Utility&oldid=966464915'
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Disk Utility User Guide
Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have.
If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.
In the Disk Utility app on your Mac, choose View > Show All Devices.
Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Utilities window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data).
In the sidebar, select a disk or volume, then click the First Aid button .
If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it. Otherwise, continue to the next step.
Click Run, then click Continue.
If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.
If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.
If you can replace a file or re-create it, delete it.
If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.
If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.
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If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers.
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If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac.
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See alsoErase and reformat a storage device in Disk Utility on MacAdd, delete, or erase APFS volumes in Disk Utility on MacPartition a physical disk in Disk Utility on Mac