rotational delay time; search time
Technical computing term for the time a disk drive spends waiting for the desired sector to rotate under the read/write head. Often used in discussions of hard disk performance.
The rotational delay time of a hard disk depends on the disk's rotation speed.
シーク時間 is the time needed to move the read/write head to the correct track, while 回転待ち時間 is the additional wait for the correct sector to rotate into position.
Compound of 回転 (rotation) + 待ち (waiting) + 時間 (time), directly describing the rotational delay in disk access.