$[2\%]$ Disk scheduling algorithms in operating systems consider only seek distances, because

$($a$).$ rotational latency is insignificant compared to the average seek time.

$($b$).$ modern disks do not disclose the physical location of logical blocks.

$($c$).$ the operating systems may have other constraints such as writes may be more urgent than reads.

$($d$).$ it is difficult to optimize seek time in disk hardware.