Consider a disk drive with the following specifications: 16 surfaces, 512…

GATE · 2005 · CS

Consider a disk drive with the following specifications: 16 surfaces, 512 tracks per surface, 512 sectors per track, 1 KB per sector, and a rotation speed of 3000 rpm. The disk uses cycle-stealing DMA. For reading, whenever one 4-byte word is ready, it is sent to memory; similarly, for writing, the disk interface reads one 4-byte word from memory in each DMA cycle. The memory cycle time is 40 ns. Which offered value is closest to the maximum percentage of time for which the CPU is blocked during DMA operation?

  1. A.

    10

  2. B.

    25

  3. C.

    40

  4. D.

    50

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