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Given disk rotation speed : 7200 RPM sectors : 500 of 512 bytes around the outer cylinder.

How long does it take to read a sector ?

Average rotational delay - (0.5 * 60 * 1000)/ 7200 = 4.166ms So disk rotate every 4.166 ms so each sector will take 4.166/500 = 0.008332 ms

So to read a single sector it's going to take 4.166 + 0.008332 = 4.1749 ms.

Correct me if I am wrong.

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  • 1/ Is this homework? 2/ What is the actual problem are you facing? Please read How do I ask a good question? and What types of questions should I avoid asking?. "You should only ask practical, answerable questions based on actual problems that you face. "
    – DavidPostill ♦
    Oct 23, 2017 at 20:12
  • Here is a very similar question the only difference seems to be the disk RPM.
    – DrZoo
    Oct 23, 2017 at 20:14
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    In case you have empty queue (no other read/write is pending operation) and the head is directly on the sector, you want to read...
    – Jaroslav Kucera
    Oct 23, 2017 at 20:22
  • "500 of 512 bytes ...." A disk has millions of sectors each cylinder has to many more than 1 sector per cylinder.
    – cybernard
    Oct 23, 2017 at 22:50

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