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Chapter: Operating Systems - File Systems

Mass Storage Structure

One of the responsibilities of the operating system is to use the hardware efficiently.

MASS STORAGE STRUCTURE

 

Overview

 

ü One of the responsibilities of the operating system is to use the hardware efficiently.

 

ü For the disk drives,

 

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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