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MASS STORAGE STRUCTURE
ü One of the responsibilities of the operating system is to use the hardware efficiently.
ü For the disk drives,
o A fast access time and
o High disk bandwidth.
ü The access time has two major components;
ü The seek time is the time for the disk arm to move the heads to the cylinder containing the desired sector.
ü The rotational latency is the additional time waiting for the disk to rotate the desired sector to the disk head.
ü The disk bandwidth is the total number of bytes transferred, divided by the total time between the first request for service and the completion of the last transfer.
ü We can improve both the access time and the bandwidth by disk scheduling.
ü Servicing of disk I/O requests in a good order.
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