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CHKDSK
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<p>In computing, CHKDSK (short for "check disk") is a <a href="/facts/System_software/I5fQq44K">system tool</a> and <a href="/facts/Command_(computing)/zUrvQbFy">command</a> in <a href="/facts/DOS/6nkoK02J">DOS</a> and <a href="/facts/Microsoft_Windows/bwhAhuSL">Microsoft Windows</a> (and related <a href="/facts/Operating_system/8XTuvMh2">operating systems</a>), as well as <a href="/facts/Digital_Research/9bYQl2pI">Digital Research</a> <a href="/facts/FlexOS/563z8WWo">FlexOS</a>, <a href="/facts/IBM/QszA7nwd">IBM</a>/<a href="/facts/Toshiba/QHRaw8Tr">Toshiba</a> <a href="/facts/4690_Operating_System/wEIsvjtF">4690 OS</a>, IBM <a href="/facts/OS%2f2/uVBl6ItP">OS/2</a>. It verifies the <a href="/facts/Data_integrity/g3XGbKIH">integrity</a> of the <a href="/facts/File_system/FdPm90uc">file system</a> on a <a href="/facts/Volume_(computing)/g94wpmdC">volume</a> (usually a <a href="/facts/Partition_(computing)/wrBk5RRS">partition</a>) and attempts to fix logical file system errors. Logical errors are typically defined as software-level problems with a filesystem (or its <a href="/facts/Metadata/qt35z79C">metadata</a>) 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 <a href="/facts/Computer_hardware/8jSjsCNv">hardware</a>-level errors, which can not be fixed with CHKDSK and may instead require <a href="/facts/Data_recovery/KvNG11I1">data recovery</a> software or expert assistance. CHKDSK is similar to the <a href="/facts/Fsck/v9IpnBLS">fsck</a> command in <a href="/facts/Unix/0pNL2seI">Unix</a> and similar to <a href="/facts/Microsoft_ScanDisk/X0Isfj4Y">Microsoft ScanDisk</a>, which co-existed with CHKDSK in <a href="/facts/Windows_9x/f1zwlghw">Windows 9x</a> and <a href="/facts/MS-DOS/fVrrz1uN">MS-DOS</a> 6.x. </p>