Consider a disk with the following characteristics: block size B = 512 bytes, interblock gap is G = 128 bytes, the number of blocks per track is 20, and the number of tracks per surface is 400. A disk pack consists of 15 double-sided disks. Calculate the average time it would take to transfer 20 random blocks and compare it with the time it would take to transfer 20 consecutive blocks using double buering to save seek time and rotational delay.

a. Time to transfer 20 random blocks is msec.

b. Time to transfer 20 consecutive blocks using double buering is msec.