DOS on IBM PC compatibles

thumb|The boot screen and command-line interface of MS-DOS 6, with an example of its directory structure thumb|The boot screen and command-line interface of FreeDOS, showing version information and an example of its directory structure

script file for Microsoft computer operating systems

creation of separate accessible storage areas on a raw computer storage device

Undeletion is a feature for restoring computer files which have been removed from a file system by file deletion. Deleted data can be recovered on many file systems, but not all file systems provide an undeletion feature. Recovering data without an undeletion facility is usually called data recovery, rather than undeletion. Undeletion can both help prevent users from accidentally losing data, or can pose a computer security risk, since users may not be aware that deleted files remain accessible.

MS-DOS error