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Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

  • A.they are memory resident
  • B.they are initially stored on disk
  • C.they are available on magnetic tapes
  • D.they are partly in primary memory and partly on disk

Answer: B

Correct answer: they are initially stored on disk

These systems are called disk operating systems because the system itself lives on disk and is loaded from there when the machine starts, rather than being held permanently in ROM as the earlier microcomputer monitors were. Managing files on disk was their central new capability.

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