2.  

A disk unit has 16 recording surfaces. It has a total of 16,384 cylinders. There is an average of 256 sectors per track. Each sector contains 512 bytes of data. The disk rotates at 7200 rpm. a) What is the maximum number of bytes that can be store in this unit? b) What is the data transfer time required to transfer a sector? c) The average seek time is 6 ms, the track-to-track access time is 1.5 ms. Successive tracks in a cylinder can be read without head movement. What is the time required to transfer a 12 Mbytes file? Explain your calculation.