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Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 11 (Page No. 81)

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A $255$-GB disk has $65,536$ cylinders with $255$ sectors per track and $512$ bytes per sector. How many platters and heads does this disk have? Assuming an average cylinder seek time of $11$ ms, average rotational delay of $7$ msec and reading rate of $100$ MB/sec, calculate the average time it will take to read $400$ KB from one sector.
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