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Gate2011_33

An application loads 100 libraries at startup. Loading each library requires exactly one disk access. The seek time of the disk to a random location is given as 10ms. Rotational speed of disk is 6000rpm. 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)

(A) 0.50s     (B) 1.50s       (C) 1.25s   (D) 1.00s

Answer

Answer: - (B)
Exp: - 6000 rotations ________ 60 sec
  1       rotation ________10 ms
 \(\therefore\) Rotational latency = 5ms
Time for one disk access = 15 ms
Time to load all libraries = 15 ×100
                                       = 1500ms
                                       = 1.5sec

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