Disk Utility
Disk Utility is a system utility for performing disk and disk volume-related tasks on the macOS operating system by Apple Inc. Functions. The functions currently supported by Disk Utility include: Disk Utility functions may also be accessed from the macOS command line with the codice_1 and codice_2 commands. It is also possible to create and manage RAM disk images by using codice_2 and codice_1 in terminal. History. 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. 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 abilities 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.