Word:

disk operating system

Noun1.disk operating system - an operating system that is on a disk
Synonyms: DOS
1.(operating system)Disk Operating System - (DOS) The original disk operating system from IBM.

DOS was the low-end OS of choice on the IBM 360, the high-end system was called just "OS". DOS had a smaller kernel and less functionality than OS and could run on the typical 32K 360/30 and 64K 360/40 class machines.

DOS was a successor to TOS.
2.(operating system)disk operating system - (DOS) The name of a number of operating systems which include facilities for storing files on disk. Such a system must handle physical disk I/O, the mapping of file names to disk addresses and protection of files from unauthorised access (in a multi-user system).

A DOS should present a uniform interface to different storage device such as floppy disks, hard disks and magnetic tape drives. It may also provide some kind of locking to prevent unintentional simultaneous access by two processes to the same file (or record).
DOS, Microsoft disk operating system, MS-DOS, operating system, OS
Browse
Disjuncture
Disk
disk access
disk brake
disk cache
Disk clutch
disk controller
disk drive
disk duplexing
Disk engine
disk error
disk farm
disk file
disk harrow
disk jockey
disk mirroring
-- disk operating system --
disk overhead
disk pack
disk shape
Disk shell
disk space
disk striping
disk-jockey
diskette
diskindness
diskjockey
Diskless
diskless workstation
disklike
Dislade
Dislang
Disleal
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