• Source: 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:

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 for 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 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. It is also possible to create and manage RAM disk images by using hdiutil and diskutil 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.




See also


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




References






External links


Online man page for diskutil
Online man page for hdiutil
• Source: Disk utility

A disk utility is a utility program that allows a user to perform various functions on a computer disk, such as disk partitioning and logical volume management, as well as multiple smaller tasks such as changing drive letters and other mount points, renaming volumes, disk checking, and disk formatting, which are otherwise handled separately by multiple other built-in commands. Each operating system (OS) has its own basic disk utility, and there are also separate programs which can recognize and adjust the different filesystems of multiple OSes. Types of disk utilities include disk checkers, disk cleaners and disk space analyzers




Disk cleaners



Disk cleaners are computer programs that find and delete potentially unnecessary or potentially unwanted files from a computer. The purpose of such deletion may be to free up disk space, to eliminate clutter or to protect privacy.
Disk space consuming unnecessary files include temporary files, trash, old backups and web caches made by web browsers. Privacy risks include HTTP cookies, local shared objects, log files or any other trace that may tell which computer program opened which files.
Disk cleaners must not be mistaken with antivirus software (which delete malware), registry cleaners (which clean Microsoft Windows Registry) or data erasure software (which securely delete files), although multifunction software (such as those included below) may fit into all these categories.




Disk compression utilities



A disk compression utility increases the amount of information that can be stored on a hard disk drive of given size. Unlike a file compression utility which compresses only specified files – and which requires the user designate the files to be compressed – an on-the-fly disk compression utility works automatically without the user needing to be aware of its existence.
When information needs to be stored to the hard disk, the utility will compress the information. When information needs to be read, the utility will decompress the information. A disk compression utility overrides the standard operating system routines. Since all software applications access the hard disk using these routines, they continue to work after disk compression has been installed. The compression/expansion process adds a small amount of overhead to disk access and may complicate error recovery on the affected volume. Also, if the compression utility's device driver was uninstalled or became corrupted, all data on the disk would be lost.
Disk compression utilities were popular especially in the early 1990s, when microcomputer hard disks were still relatively small (20 to 80 megabytes). Hard drives were also rather expensive at the time, costing roughly 10 USD per megabyte. For the users who bought disk compression applications, the software proved to be in the short term a more economic means of acquiring more disk space as opposed to replacing their current drive with a larger one. A good disk compression utility could, on average, double the available space with negligible speed loss. Disk compression fell into disuse by the late 1990s, as advances in hard drive technology and manufacturing led to increased capacities and lower prices.
Some examples of disk compression utilities:

DriveSpace for Microsoft Windows
DiskDoubler for Macintosh
SquashFS for Linux




Disk checkers



A disk checker is a utility program which can scan a hard disk to find files or areas that are corrupted in some way, or were not correctly saved, and eliminate them for a more efficiently operating hard drive. This is not to be confused with a disk cleaner, which can find files that are unnecessary for computer operation, or take up considerable amounts of space.
Some disk checkers can perform a whole surface scan to attempt to find any possible bad sectors, whereas others scan only the logical structure of files on the hard disk.
Operating systems often include one such tool. For example:

CHKDSK
fsck




Disk layout tools



Disk formatting and disk partitioning tools are responsible for generating low level disk layouts and file systems. Operating systems typically supply one or more programs performing these functions as part of their standard install:
In Windows:

Logical Disk Manager
format
fdisk
diskpart
In Mac OS:

Disk Utility
In Linux:

Logical Volume Manager
GNOME Disks (also known as Disks or gnome-disk-utility or palimpsest)
GNU Parted




Disk space analyzers



A disk space analyzer (or disk usage analysis software) is a software utility for the visualization of disk space usage by getting the size for each folder (including sub-folders) and files in a folder or drive. Most of these applications analyze this information to generate a graphical chart showing disk usage distribution according to folders or other user defined criteria.
Some disk space analyzers like DiskReport allow analysis of history of size and file count for each folder, to help find growing folders.
Examples:

Directory Report
WizTree
DiskReport
GNOME Disk Usage Analyzer
KDE Filelight
WinDirStat
SpaceSniffer
TreeSize




References

Kata Kunci Pencarian:

• DOS
• Sektor rusak
• AVG PC TuneUp
• Pemulihan data
• Rufus (perangkat lunak)
• Partisi (sistem berkas)
• PlayStation 2
• True Burner
• Fedora (sistem operasi)
• PC Tools File Recover
• Disk Utility
• Disk utility
• Ghost (disk utility)
• Disk Cleanup
• Utility software
• Disk formatting
• List of built-in macOS apps
• Disk partitioning
• GNOME Disks
• Disk Drill