Question

for a disk with 100 tracks (range 0-99) 82,56, 13, 23, 64, 19, 78. Head pointer starting at 60​

Answer 1

Answer:

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Answer 2

Explanation:

Next Served Distance Traveled

50 0

45 5

60 15

70 10

80 10

90 10

25 65

20 5

10 10

-----------------------------------

Total Dist = 130

If Simple SCAN is used, requests are served as following

Next Served Distance Traveled

50 0

60 10

70 10

80 10

90 10

45 65 [disk arm goes to 100, then to 45]

25 20

20 5

10 10

-----------------------------------

Total Dist = 140

Less Distance traveled in SSTF = 130 - 140 = 10

Therefore, it is not additional but it is less distance traversed by SSTF than