8M file, saving on a disk which has 500byte/sector, 4 sectors/cluster, 100sectors/track, 100 cylinders, 10 tracks/cylinder, spindle speed is 6000rpm,...

8M file, saving on a disk which has 500byte/sector, 4 sectors/cluster, 100sectors/track, 100 cylinders, 10 tracks/cylinder, spindle speed is 6000rpm, average seek time is 8ms. Suppose there is a rotational delay when switching tracks on same cylinder, How many clusters does this file need? If these clusters are allocated contiguously, what is the time for reading this file? Do clusters really matter on reading time? If these clusters are totally scattered around, no any two are adjacent, what is the time now? Do clusters matter on reading time now?