DOS

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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 ?
Only both would tell you that DOS stands for "Disk Operating System." No sir, computerese is not for the faint of heart.
0-This is the latest version of the disk operating system and, according to Harris, it improves computing capabilities by increasing memory, adding a feature that recalls the last command the computer executed, offering a more intuitive screen-editing process, and providing immediate help when the user needs it.
The standard disk operating system (DOS) for PCs contains another significant vulnerability in how certain utilities store and copy data.