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Why is an operating system called disk operating system?

Updated: 8/16/2019
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15y ago

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An operating system is / was called a "disk" operating system because it was stored on a floppy disk or hard drive, as opposed to either being embedded in a ROM chip (like early versions of Mac OS were), or stored on a cartridge, cassette, tape reel, or some other storage medium. The usage fell out of favor due to the popularity of MS-DOS: "DOS" was thereafter used to refer only to MS-DOS or compatible operating systems.

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15y ago
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Q: Why is an operating system called disk operating system?
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