Disk Utility

Disk Utility is a system utility for performing disk and disk volume-related tasks on macOS.

Features include:

• Create, convert, backup, compress, and encrypt logical volume images from a wide range of formats to .dmg or, for CD/DVD images, .cdr
• Mount, unmount and eject disk volumes (including hard disks, removable media, and disk volume images)
• Enable or disable journaling
• Verify a disk's integrity, and repair it if damaged (works for both Mac-compatible partitions and for FAT32 partitions with Windows installed)
• Erase, format, partition, and clone disks
• Securely delete free space or disk using a "zero out" data, a 7-pass DOD 5220-22 M standard, or a 35-pass Gutmann algorithm
• Add or change partition table between Apple Partition Map, GUID Partition Table, and master boot record (MBR)
• Restore volumes from Apple Software Restore (ASR) images
• Check the S.M.A.R.T. status of a hard disk

Disk Utility functions may also be accessed via the command line with commands diskutil and hdiutil. The commands also can create and manage RAM disk images.