Assume that a hard disk has the following characteristics: Rotation speed=7,200

Question

Assume that a hard disk has the following characteristics:

Rotation speed=7,200 rev/min arm;

Arm movement time=0.5 msec fixed startup time+0.05 msec for each track crossed. (the startup time is a constant no matter how far the arm moves.) Assume on average the disk arm must move 150 tracks. Number of surfaces=2 (This is a double-sided disk. A single read/write arm holds both read/write heads.)

Number of tracks per surface=500

number of sectors per track=20;

Number of characters per sector=1,024.

a.) How many characters can be stored on a single floppy disk?

b.) What are the best-case,worst-case,and average-case access times for this disk?

Explanation / Answer

Assume that a hard disk has the following characteristics: Rotation speed=7,200

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