Answer to Question #44368 in Math for Sujata Roy

Question

A disk has 8 equidistant tracks. The diameters of the innermost and outermost tracks are 1 cm and 8 cm respectively . The innermost track has a storage capacity of 10 MB.
[1] what is the total amount of data that can be stored on the disk if it is used with a drive that rotates it with
(1) Constant linear velocity
(2) Constant Angular velocity
(A) (1) 80 MB (2) 2040 MB (B) (1) 2040 MB (2) 80 MB
(C) (1) 80 MB (2) 360 MB (D) (1) 360 MB (2) 80 MB

[2] If the disk has 20 sectors per track and is currently at the end of the 5th sector of the inner most track and the head can move at a speed of 10 m/sec and it is rotating at constant angular velocity of 6000 rpm, how much time will it take to read 1 MB contiguous data starting from the sector 4 of the outer most track?
(A) 13.5ms (B) 10ms (C) 9.5ms (D) 20ms