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Disk Total access time

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Consider a typical disk that transfers at a rate of 30 MBps and rotates at 5000 RPM. The average seek time of disk is twice average rotation delay and assume no controllers transfer time then, what is average time(in ms) to read or write 1 MB of data ?

  1. 48 ms
  2. 45 ms
  3. 55 ms
  4. 51 ms
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