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Consider an imaginary disk with $40$ cylinders. A request come to read a block on cylinder $11$. While the seek to cylinder $11$ is in progress, new requests come in for cylinders $1, 36, 16, 34, 9$ and $12$ in that order. The number of arm motions using shortest seek first algorithm is

  1. $111$ ​
  2. $112$ 
  3. $60$
  4. $61$ 
in Operating System by Boss (30.2k points)
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11-12-9-16-1-34-36 sequence of access..

So 1+3+7+15+33+2=61
by Boss (25.5k points)
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Can you please  tell me the solution  in detail.

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