It is true, in general, look disk head scheduling will involve less movement of the disk heads than scan disk head scheduling.
When compared to FCFS, SCAN, C-SCAN, and C-LOOK disk scheduling algorithms with regard to these parameters, a few algorithms, such as SSTF and LOOK, will be the most effective algorithms.
The elevator algorithm is a disk scheduling technique, commonly referred to as a scan algorithm, in which the head begins at one end of the disk and goes to the other end, completing each request along the way.
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