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Operating Systems Concepts - Engineering

Q1:

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

E None of the above

ANS:B - they are initially stored on disk

Microcomputer's operating systems like Apple DOS, MS-DOS and PC DOS etc are called disk operating systems because they are initially stored on disk.