CHKDSK

chkdsk

CHKDSK on boot in Windows XP
Original author(s)	Tim Paterson
Developer(s)	SCP, Microsoft, IBM, DR, Datalight, Novell, Toshiba, PhysTechSoft, ReactOS Contributors
Initial release	1980; 45 years ago (1980)
Written in	MS-DOS: x86 assembly language FreeDOS, ReactOS: C
Operating system	86-DOS, MS-DOS, PC DOS, MSX-DOS, SISNE plus, OS/2, eComStation, ArcaOS, FlexOS, DR-DOS, ROM-DOS, 4690 OS, PTS-DOS, Windows, FreeDOS, ReactOS
Platform	Cross-platform
Type	Command
License	MS-DOS: MIT FreeDOS, ReactOS: GPLv2
Website	learn.microsoft.com/de-de/windows-server/administration/windows-commands/chkdsk

In computing, CHKDSK (short for "check disk") is a system tool and command in DOS and Microsoft Windows (and related operating systems), as well as Digital Research FlexOS,^[1] IBM/Toshiba 4690 OS,^[2] IBM OS/2.^[3] It verifies the integrity of the file system on a volume (usually a partition) and attempts to fix logical file system errors. Logical errors are typically defined as software-level problems with a filesystem (or its metadata) as a result of prior software malfunction (e.g. crashes) or irregular use (e.g. hard resets). Logical errors are contrasted with and usually less severe than hardware-level errors, which can not be fixed with CHKDSK and may instead require data recovery software or expert assistance. CHKDSK is similar to the fsck command in Unix and similar to Microsoft ScanDisk, which co-existed with CHKDSK in Windows 9x and MS-DOS 6.x.