(Solved) : 16 Surfaces 100 000 Tracks Per Surface Disk Rotates 8800 Rounds Per Minute Track Consists Q44081934 . . .
• There are 16 surfaces, each with 100,000 tracks per surface. • The disk rotates at 8800 rounds per minute. • Each track consists of 1024 sectors, each of which can store 1024 bytes. • 10% of each track is used for gaps. • The overhead to move the r/w head to a different cylinder is 1 ms, plus lms to move over 5000 tracks. Suppose we use mirrored disks of the kind introduced in the question above. Also suppose the probability of any disk failure is 5%. (a) What is the mean time to a disk failure resulting in loss of data, assuming it takes 5 hours to replace a disk? (b) Also determine how long it takes actually to copy the entire disk. Show transcribed image text • There are 16 surfaces, each with 100,000 tracks per surface. • The disk rotates at 8800 rounds per minute. • Each track consists of 1024 sectors, each of which can store 1024 bytes. • 10% of each track is used for gaps. • The overhead to move the r/w head to a different cylinder is 1 ms, plus lms to move over 5000 tracks. Suppose we use mirrored disks of the kind introduced in the question above. Also suppose the probability of any disk failure is 5%. (a) What is the mean time to a disk failure resulting in loss of data, assuming it takes 5 hours to replace a disk? (b) Also determine how long it takes actually to copy the entire disk.
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