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Tim Paterson
Developers SCP, Microsoft , IBM, Datalight, dr, Novell, Authors Toshiba, PhysTechSoft, ReactOS
First publication 1980; 42 years ago (1980)
Written in MS-DOS: x86 assembly language
FreeDOS , ReactOS : C< /td>
Operating System 86-DOS, MS-DOS, PC-DOS, MSX-DOS, SISNE plus , OS /2, eComStation, ArcaOS, FlexOS, DR-DOS, ROM-DOS, OS 4690, PTS-DOS, Windows, FreeDOS, Scope=”row”>Platform Cross-platform
Enter Command
License MS-DOS: MIT
FreeDOS, ReactOS: GPLv2

In computer engineering, CHKDSK From (abbreviation for “Check Disk”) is a system path and command in DOS, Digital Research FlexOS, [1] IBM/Toshiba. 4690 IBM os,[2] OS/2,[3] Microsoft Dos Logic and related operating gadgets. It checks the correctness of the volume system files and tries to fix system logical file errors. is it similar to the fsck handler in Unix and the Microsoft equivalent that scandisk coexisted with CHKDSK in Windows 9x and MS-DOS 6.x.


An early “check disk implementation” of CHECKDSK War, which was part of the diagnostic equipment from Digital Equipment Corporation and raged TENEX at TOPS-20 and in the early 1970s.[4]


The CHKDSK command was first executed in 1980 by Tim and Paterson at Seattle Computer Products 86-DOS.[6]


Can chkdsk make things worse?

Unfortunately, Chkdsk can make things worse if, as you find, the file system is seriously corrupted.

This command is available in later versions of MS-DOS and.[7]
CHKDSK is like an external command. Versions of MS-DOS 2.x-4.x use as part of each of our executables. MS-DOS version 5.x and later use chkdsk.exe as the executable.[8]

MS-DOS 5.And also 0 error

chkdsk UNDELETE in 5 ms-dos.0 has a similar feature that can corrupt data: However, the disk file allocation table uses sectors, 256, which CHKDSK /F can easily lead to data loss, and running UNDELETE can lead to unpredictable results. This usually refers to the capacity of the hard drive, a multiple of 128 MB. This affects CHKDSK.and exe in addition to UNDELETE.EXE with the April 9, 1991 timestamp. This bug is fixed in MS-DOS 5.0a.[ 9 ]< /up>

Microsoft Windows

How do I repair Windows 10 with command prompt?

Click Startup Repair.
Click System Restore.
Choose your username.
Enter password.
Enter “cmd” in the principal search field.
Right-click command prompt and select “Run as administrator”.
Type sfc for the /quick scan command and press Enter.

How do I fix errors using CMD?

Click Start.
Type cmd in the program and search for it in the file search box.
Right click cmd.exe.
Click Run as administrator.
Enter the administrator password.
When cmd.exe opens, enter the command: chkdsk.
Press Enter.
You can run the tool using additional options such as: chkdsk deborah: /r.

CHKDSK can nowCan be run from DOS command prompt, Windows Explorer, Windows command prompt, PowerShell, or Recovery Console.[10]

On Windows with nt functions CHKDSK can also check the surface of a CD for bad sectors and repair them (in MS-DOS 6.x and even Windows 9x one of the tasks performed becomes Microsoft ScanDisk) . The Windows Server version of CHKDSK is RAID compatible and can also completely rebuild bad sector data from a hard drive into a proper RAID 1 or 5 raid array if the hard drives in the set are actually good.< soup>[11]

Fragments of file directories that are considered corrupt due to, for example, power failures while writing, excessive length of music files, invalid names and/or characters in filenames, are moved to this directory in the root of the partition, names found. 000 and renamed to regular hex files and directories that precede file00000000c.chk or dir_00000000.chk. [12] < sup>[13]

In the NT windows family, a standard CHKDSK scan consists of file selection metadata in three steps. He’s looking for mistakeso does not correct them unless the mind is specifically ordered to do so. The same applies to the scanned surface – this test, which can be very time consuming with large or poorly performing plates, should only be performed if clearly required. Recovery Volume requires exclusive write access to chkdsk.[14][15]

Due to our accessibility requirements for overloaded drives, CHKDSK will never be able to check a system drive in a normal system-wide fashion. Instead of approaching this, dirty puts the bit on someone’s hard drive and reboots the computer. startup On Windows, the confidential version of CHKDSK (the autochk application in native mode) was launched by SMSS.EXE, which checks and tries to repair the file system. the dirty bit is set.

Does chkdsk fix corrupt files?

How do you repair such file corruption? Windows provides a proprietary chkdsk utility that can fix the maximum number of errors on the drive. The chkdsk utility must be run directly from an admin command line in order to do its job.

Because access requirements and the cumbersome CHKDSK process have been eliminated, Windows Vista introduces a new file permission state model in which the operating system corrects errors on volumes regardless of how it detects them. If samplesIf the lemma is serious and requires further analysis, Center prompts the user to immediately take the volume offline.[16]

Windows Vista and Windows 2008 server have added a self-healing feature that is enabled by default, in addition to sharing the CHKDSK command. It detects a powerful file system and automatically handles errors on the fly. Thus, many of the problems previously discovered with CHKDSK never occur. c This is a managed command fsutil repair.[17][18]

There has been criticism of AUTOCHK‘s tendency to automatically change the file system unless specifically requested by a nutritionist, who may want to back up previously unique data that only one recovery attempt can salvage – and encrypt, spoof, or disallow directory paths even in a multi-boot installation when multiple operating systems may conflict with the same partition.[19] [20][21]

Supposed Windows 7 error

How do I run chkdsk and fix errors?

click Start, then My Computer.
Right-click the hard drive to analyze and select Properties.
In the “Local Properties” window, navigate to the “Drive” tab, “Tools”.
Click Check Now.
In the Check Local Disk window, select the Automatically fix system file errors check box.
Click Start.

Prior to the release of Windows 7, InfoWorld reported on the allegedCHKDSK internal memory check; specific According to the report, the chkdsk /r command should cause memory usage to near maximum and crash the system. Randall K. Kennedy of InfoWorld wrote the original report in “various sources and on the Internet”, saying that in his tests the memory consumption should exceed 90%, although he did not experience any crashes. Despite this, Kennedy viewed the overall memory consumption as a necessary bug that could crash the Windows 7 version and scolded Microsoft. Sinofsky also responded that Microsoft can’t reproduce the crash, it could be that the massive memory content is for improving the exploit, not exposing it. Ed von bott ZDNet also confirmed this by stating his own tests and reporting that the crashes will not. Noting that, by its nature, chkdsk /r runs less than the system when Windows is online, Bott concluded, “Maybe it’s a feature, not a perfect bug, and chances are it is. like this is very, very small, comprehensive and avoidable.”[24]

DR/Novell DOS

DR 6 dos.0 also includes an implementation of the current command CHKDSK.[25]


The freedos version is under Leber development by imre and is currently licensed under the GNU GPL 2.[26]


The ReactOS implementation is based on a free clone developed by [27], Russinovich in honor of Sysinternals in 1998.
It reverted to ReactOS custom Emanuele Aliberti for And Back 1999 and supports volumes that normally use the FAT32 file system.
This does not affect maintenance volumes using the Btrfs filesystem, but ReactOS has supported it since version 0.4.1. Also

  • Defragment
  • Purge data
  • list

    View Filesystems

  • e2fsprogs


Further Reading

  • Wolverton, (1990) van. MS-DOS Commands: Microsoft Reference, Quick 4th Edition revised. Microsoft press office. ISBN 978-1556152894.
  • Kathy Ivens; Brian Profit (1993). bone/2 inside and outside. Osborne McGraw Hill. ISBN 978-0078818714.
  • Frish, Elin (2001). Pocket guide to 2000 windows commands. O’Reilly. ISBN 978-0-596-00148-3.

External Links

  • Official Microsoft CHKDSK Readme
  • Open source CHKDSK implementation often with MS-DOS v2.0 shipping


  1. ^ “Flexography User’s Guide”. 1986. Retrieved September 14, 2020
  2. ^ [1][broken link]
  3. ^ “Archived copy”. From the original archived top dated April 14, 2019. Retrieved July 20, 2019 Cite Web: Old cs1 service: as header copy ( )
  4. ^ link “134-TENEX JOBZRO.MAC”. bitsavers. 1979-09-16. from Archived all originals on January 27, 2019. Accessed on 8/14/2020.

    Should I use chkdsk F or R?

    If you are running chkdsk /f* on a very large drive or on a drive with a very large number of files (e.g. archive, millions of files), it will take a long time to run chkdsk /f. Use the /r option to find physical disk errors on these file systems and attempt to recover data from all affected disk configurations.

    Does chkdsk fix corrupt files?

    Why should we really have such corruption? Windows provides a valuable tool called chkdsk that should fix most disk errors. The utility needs to run chkdsk from an admin command to do its job.