disk operating system

American  

noun

Computers.

1. DOS.

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disk operating system British  

noun

1. Often shortened to: DOS.  an operating system used on a computer system with one or more disk drives

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Example Sentences

The company that Bill Gates and Paul Allen founded in 1975 made a splash with its Disk Operating System.

From The Wall Street Journal

That product, called Microsoft Disk Operating System, or MS-DOS, was a watershed for the company.

From New York Times

Eventually the product refined by Microsoft - and renamed DOS, for Disk Operating System - became the core of IBM PCs and their clones, catapulting Microsoft into its dominant position in the PC industry.

From Washington Times

For those too young to remember, DOS was the Disk Operating System that ran most household PCs from 1981 until around the turn of the millennium. 

From Los Angeles Times

Disk operating system computers were popular in the 1980s and early 1990s.

From BBC