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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.
References in periodicals archive ?
Windows/386 is an environment from Microsoft that adds substantial value to the disk operating system.
5 and 2000, and ServerProtect(TM) scored 100%, the highest score possible, when evaluated on detection of disk operating system (DOS) file viruses, Microsoft(R) Windows(R) 32-bit file viruses, macro viruses, and script viruses.
It was not until the Space and Naval Warfare deployment of the original Disk Operating System (DOS)-based FSM application that Navy food service took the first step in moving away from manual processes.