Disk Utility

This article is about the software by Apple Inc. For disk utilities in general, see disk utility.

Disk Utility

Disk Utility running on OS X 10.11 El Capitan
Developer(s)	Apple Inc.
Stable release	15 / September 30, 2015 (2015-09-30)
Written in	C, Objective-C
Operating system	OS X
Type	Utility
License	Proprietary
Website	{{#property:P856}}

Disk Utility is a system utility for performing disk and disk volume-related tasks on the OS X operating system by Apple Inc.

Functions

The functions currently supported by Disk Utility include:

• 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 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 Table, 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 OS X command line with the diskutil and hdiutil commands.

History

In versions of 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 (multi-pass formatting) on a disk was not added until Mac OS X 10.2.3. 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, create and manage disks formatted as RAID, burn discs and multi-pass format internal solid-state drives and encrypted external drives.

See also

• Apple Software Restore
• Logical Disk Manager
• Palimpsest Disk Utility
• GNU Parted
• diskpart
• fdisk
• cfdisk

External links

• Apple online man page for diskutil
• Apple online man page for hdiutil