Payroll is a good example of a case in which batch processing, by using magnetic tape, is considered appropriate. Explain why payroll is typically considered a good application for this type of storage device.
Oliver Owl’s night job at the university computing center is to change the tapes used for overnight data backups. While waiting for each tape to complete, he works on writing his thesis that proves Shakespeare’s plays were written by extraterrestrial visitors. His text processor runs on the system being backed up since that is the only one they have. Is there a problem with this arrangement?
Suppose that a disk drive has 3000 cylinders, numbered 0 to 2999. The drive is currently serving a request at cylinder 140, and the previous request was at cylinder 125. The queue of pending requests in FIFO order, is 66, 147, 913, 289, 202, 1750, 15
Starting from the current head position, what is the total distance(in cylinders) that the disk arm moves to satisfy all the pending requests, for each of the following disk-scheduling algorithms?
