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 ?
DELL has found a solution to the problem by shipping naked computers with a copy of FreeDOS in the box to satisfy the Microsoft licensing police.
Except for BeOS, FreeBSD, FreeDOS, Solaris, OS/2 MacOS, AmigaOS or any of the approximately 50 flavours of Linux.