Question

A hard disk with 1 platter rotates at 15000 rpm and has 1024 tracks each with 2048 sectors and every sector is having 512 bytes. The disk head starts at track 0 the disk then receives a request to access a random sector on a random track. If the seek time of the disk head is 1 ms for every 100 tracks it must cross.
What is the average rotational latency?
a) 1 msec b) 2 msec c) 3msec d) 4 msec

For the above data what is the data transfer rate?
a) 100 MBPS b) 250 MBPS c) 100 GBPS d) 250 GBPS