Seek time:-
The total amount of time required for information on a disk drive to be found. The lower this value is the faster the hard drive will be able to find or read data. Examples of common hard drive seeks times are 8ms and 10ms.
Rotational Latency Time:-
Rotational delay or rotational latency is the time required for the addressed area of a computer’s disk drive (or drum) to rotate into a position where it is accessible by the read/write head. The term applies to rotating storage devices (such as a hard disk or floppy disk drive, and to the older drum memory systems).

Rotational delay is one of the three delays associated with reading or writing data on a disk, and somewhat similar for CD or DVD drives. The others are seek time and transfer time. Sometimes spin-up time is considered as an independent fourth factor though it is a rotational delay that only affects systems that automatically spin down (turn off) drives to conserve power, noise, etc..

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