Disk management systems


#1

There are 200 tracks on a disk platter and the pending requests have come in the order -36,69,167,76,42,51,126,12 and 199.Assume the arm is located at the 100th track and moving towards track 200.If sequence of disc access is 126,167,199,12,36,42,51,69 and 76 then which disc access scheduling policy is used?

A)Elevator
B)Shortest seek-time first
C)SCAN
D)First Come First-Served


#2

Option C should be CSCAN instead of SCAN because elevator algorithm is nothing but SCAN itself. And the correct answer is CSCAN i.e. option C


#3

Option c is the correct SCAN