Disk Operating System


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disk operating system

[¦disk ¦äp·ə‚rād·iŋ ‚sis·təm]
(computer science)
An operating system which uses magnetic disks as its primary on-line storage. Abbreviated DOS.

Disk Operating System

(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.

disk operating system

(operating system)
(DOS) The name of a number of operating systems which include facilities for storing files on disk, often used to refer to Microsoft DOS. 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).
References in periodicals archive ?
1, as well as IBM Disk Operating System (DOS) versions 3.
They are called shells because they provide a separation from the disk operating system (DOS), the complex software that every computer needs to function.
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.