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DOS (Disk Operating System)

a COMPUTER program which enables a computer to record and retrieve data from a rotating magnetic or vinyl disk. The most widely-used disk operating system is MSDOS, which is used on computers that are compatible with the IBM personal computer.
Collins Dictionary of Business, 3rd ed. © 2002, 2005 C Pass, B Lowes, A Pendleton, L Chadwick, D O’Reilly and M Afferson
References in periodicals archive ?
* DOS operating system -- standard 16-bit software environment for easy development.
came as part of the computer's DOS operating system.
The biggest change is the accelerating swing from the DOS operating system to Windows.
This is an opportunity to sell RAM [random access memory], and to sell to those consumers who were so intimidated by the DOS operating system."