Question: 11.7 Why is it difficult to fully erase data from a magnetic medium such as tape or disk? 11.20 Suppose that a disk drive has

11.7 Why is it difficult to fully erase data from a magnetic medium such as tape or disk? 11.20 Suppose that a disk drive has 5,000 cylinders numbered O to 4,999. The drive is currently serving a request at cylinder 143, and the previous request was at cylinder 125. The queue of pending requests in FIFO order is 86, 1470,913, 1774,948, 1509, 1022, 1750, 130 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? a. FCFS b. SSTF c. SCAN

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