Which components constitute the disk service time? Which components constitute the largest percentage of the disk service time in a random I/o operation?
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The components constituting the disk service time are Seek time, rotational latency and data transfer rate.
The large percentage of the disk service time in a random I/o operation is constituted by seek time.
(1) Seek Time :
- Disk drive takes time to locate the area on the disk where the data which is to be read, needs to be stored.
- Seek time takes most of the disk service time.
(2) Rotational latency:
- It also known as rotational delay, is the delay in waiting for the disk to rotate and to bring the required disk sector under the read-write head.
(3) Data transfer rate :
- It is the amount of the data that is transferred from one point to other in a given amount of time.
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