DOS

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DOS

[dos]
abbreviation for disk operating system. A generic term describing an operating system loaded from disk devices, the hard drive in modern computers, when the system is started or rebooted.

DOS

Abbreviation for date of service.
References in periodicals archive ?
Some of the suggested techniques involve nothing more than using attributes of Microsoft's disk operating system (MS-DOS); others require purchasing a software package.
Six involved accessing mail servers to distribute thousands of e-mails and two concerned attacks on disk operating systems.
Basics of Microcomputer Disks and Disk Operating Systems