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Consider a disk with 16384 bytes per track having a rotation time of 16 msec and average seek time of 40 msec. What is the time in msec to read a block of 1024 bytes from this disk?

  1. 57 msec
  2. 49 msec
  3. 48 msec
  4. 17 msec
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Transfer time = ((1024 bytes *16 ms)/ (16384 bytes )) = 1 msec

Rotational letency = 16 msec / 2 = 8 msec

total time = seek + rotational letency + transfer time

              = 40 + 8 + 1 = 49 msec

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