Disk Utility

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This article is about the Mac OS software by Apple. For disk utilities in general, see disk utility.
Disk Utility
Disk Utility screenshot.png
Disk Utility running on OS X 10.10 Yosemite
Developer(s) Apple Inc.
Stable release 13 / October 16, 2014; 10 months ago (2014-10-16)[1]
Written in C, Objective-C
Operating system OS X
Type Utility
License Proprietary

Disk Utility is an Apple OS X operating system utility for performing disk and disk volume-related tasks.


The functions currently supported by Disk Utility include:[2]

Disk Utility functions may also be accessed from the OS X command line with the diskutil and hdiutil commands.


In versions of the Mac OS prior to Mac OS X, 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 on a disk was not added until Mac OS X 10.2.3.[7] 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 the preview of OS X El Capitan, Disk Utility has a new user interface and loses the ability to repair permissions due to obsolescence.[8]

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