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A) How long does it take to read 1,056,000 contiguous bytes from a disk with these...

A) How long does it take to read 1,056,000 contiguous bytes from a disk with these specs: Block (sector) size: 512 bytes Sectors per track: 180 IODCU overhead: 1.6 ms Seek time: 11 ms Rotation speed: 12,500 RPM B) A disk has 250 (512 byte) blocks per track and a data transfer rate of 22.4 Megabytes per second. What is the disk's rotational speed in revolutions per minute (RPM)?

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Answer #1

A. T=1.6+1/(2×11)+1056000/(11×512)

=1.6+0.045+187.5

=189.145 ms

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