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Pipeline and Vector Processing Q.43

0. An application loads 100 libraries at start-up. Loading each library requires exactly one disk access. The seek time of the disk to a random location is given as 10 ms. Rotational speed of disk is 6000 rpm. If all 100 libraries are loaded from random locations on the disk, how long does it take to load all libraries? (The time to transfer data from the disk block once the head has been positioned at the start of the block may be neglected.)

  • Option : B
  • Explanation : 6000 rotations ________ 60 sec
    1 rotation _________ 10 ms
    Rotational latency = 5 ms
    Time for one disk access = 15 ms
    Time to load all libraries = 15 * 100
    = 1500 ms = 1.5 sec
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