Problem
A memory has 8 megabytes of cells
(a) What is the size of its MAR?
(b) If 2-dimensional addressing is used, what is the size of each of the horizontal and vertical decoders?
Assume that a hard disk has the following characteristics: Rotation speed = 7,200 rev/min Arm movement time = 0.5msec fixed start-up time + 0.05 msec for each track crossed Number of surfaces = 2 (double-sided disk) Number of tracks per surface = 500 Number of sectors per track = 20 Number of characters per sector = 1,024
(a) How many characters can be stored on the disk?
(b) What are the best case and worst case access time for the data (in a sector)?