磁盘操作系统是早期个人电脑上使用的一种主要操作系统，习惯上按其英文缩写称作DOS(Disk Operation System)。最早的DOS系统是由微软公司为IBM个人电脑开发的，即MS-DOS。后来这一概念也包括了其他公司生产的与MS-DOS兼容的系统，如PC-DOS、DR-DOS, 以及少数一些不太出名的DOS兼容产品。它们在1985年到1995年间占据操作系统的统治地位。

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Verified (*) indicates that the DOS kernel file size/date/time was matched against an archived copy

DOS Version History

Author Unknown

Version　Year　Features
 1.0　　　1981　Original Disk Operating System
 1.1　　　1982　Support for double-sided disks
 2.0　　　1983　Support for sub directories
 2.01　　 1983　Support for international symbols
 2.25　　 1983　Bug fixes
 3.0　　　1984　Extended character set, large hard disks
 3.1　　　1984　Support for PC networks, bug fixes
 3.2　　　1986　Support for 3.5-inch disks
 3.3　　　1987　Support for PS/2 computers
 4.0　　　1988　Support for large partitions
 4.01　　 1989　Bug fixes
 5.0　　　1990　New shell, new editor, smaller kernel, memory management
 6.0　　　1993　Disk Compression, better Memory Management, and AntiVirus
 　　　　　　　 software now included in the operating software.
 6.2　　　1993　Microsoft claims it was not a bug fix for 6.0,
 　　　　　　　 but most observers saw it as that.