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In systems prior to OS X El Capitan, a permissions repair can be performed by selecting a startup volume and clicking the "Repair Disk Permissions" button in the "First Aid" section of Disk Utility. The operation can also be performed by using the diskutil command-line utility. [ 6 ]
After analyzing the disk directory, Disk First Aid determines whether it is able to repair any damage that was detected. The utility can commonly only fix problems associated with the catalog/extents files and the volume bitmap. [4] Commonly, the program reports that there is an error, but cannot fix it. [3]
TestDisk is a free and open-source data recovery utility that helps users recover lost partitions or repair corrupted filesystems. [1] TestDisk can collect detailed information about a corrupted drive, which can then be sent to a technician for further analysis.
Disk Wipe: Irrecoverably erases data from hard disk Computer Management: A group of utilities that help retrieve system information, enable, disable or manage device drivers, Windows services and software that run during computer startup, inspect the event logs of the offline system and manage partitions.
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)
On Windows NT operating systems, CHKDSK can also check the disk surface for bad sectors and mark them (in MS-DOS 6.x and Windows 9x, this is a task done by Microsoft ScanDisk). The Windows Server version of CHKDSK is RAID-aware and can fully recover data in bad sectors of a disk in a RAID-1 or RAID-5 array if other disks in the set are intact. [11]
It included a more user-friendly interface than CHKDSK, more configuration options, [2] [3] and the ability to detect and (if possible) recover from physical errors on the disk. This replaced and improved upon the limited ability offered by the MS-DOS recover utility. [4] Unlike CHKDSK, ScanDisk would also repair crosslinked files. [5]
For information about generic boot/recovery discs, see Recovery disc; A Microsoft Windows Emergency Repair Disk (ERD) is a specially formatted diskette that creates backups of important system files and settings and is used to troubleshoot and repair problems in Microsoft Windows NT and Windows 2000 systems. An ERD is used in conjunction with ...