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- Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999. The drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. The queue of pending requests, in FIFO order, is:2,069 1,2122,2962,8005441,6183561,5234,9653681a. FCFSb. SSTFc. SCANd. LOOKe. C-SCANf. C-LOOKSuppose the head of a moving head disk with 200 tracks numbered 0-199 is currently servinga request at track 143. It has just finished a request at track 125. If the queue of requests iskept in the FIFO order,86,147,85,177,94,150,102,175,130What is the total head movement to satisfy these requests for the following disk schedulingalgorithms? First Come First Served Shortest Seek Time First SCANIf AES-192-CBC is used for encrypting a file of size 1800 byte, then find the total number of blocks that are generated by the whole process?
- Consider a disk queue with requests for I/O to blocks on cylinders.98 183 37 122 14 124 65 67. "Considering SSTF (shortest seek time first) scheduling", the total number of head movements is, if the disk head is initially at 53 is?Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 133, and the previous request was at cylinder 115. The queue of pending requests, in FIFO order, is:76,1460, 903, 1764, 938, 1499, 1012,1740,120. 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 (d) LOOK (e) C-SCAN (f) C-LOOKConstruct an experiment to estimate the speed at which a particular computer can process an authentication password. From that estimate, determine how long it would take to test common password candidate lists, such as a list of 100 or 1000 popular passwords, the same list enhanced with orthographic substitutions (3 for e, zero for O, one for l, 2 for z, and so forth), and a word list from a common online dictionary.
- Find out the total Head Movement of the Disk Head for the following request queue: 98, 183, 37, 122, 14, 124, 65, 67 Using the algorithms: a) FCFS b) SSTF c) SCAN d) C-SCAN e) C-LOOK The question did not state any initial head cylinder number.Suppose that a disk drive has 100 cylinders, numbered from 0 to 99. The queue which is maintained is 10, 20, 50, 70, 80 in order. The disk arm is initially at cylinder 40. Starting from the current head position, what is the total distance (head movement) for SSTF algorithms? LOOKConsider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10. The C-LOOK scheduling algorithm is used. The head is initially at cylinder number 63, moving towards larger cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199. The total head movement (in number of cylinders) incurred while servicing these requests is
- 1) Given an O/S with soft timers using a single clock, consider a situation where the event list looks like this: Current time = 4105; Next Signal = 6; Clk Header → 6 → 1 → 3 → 12 → 5 a. What will current time be when the “12” signal is dispatched = b. At time 4113 a new signal arrives to be scheduled for 4125, fill in the following to reflect this signal being added at that time: Current time = ; Next Signal = ; Clk Header → 2) Given a disk with 100 tracks, Consider the following disk request sequence (track numbers): 45, 20, 90, 10, 50, 60, 80, 25, 70. The initial position of the R/W head is on track 50. Determine the distance that will be traversed by the R/W head when the Shortest Seek Time First (SSTF) algorithm is used and the Elevator algorithm (note -the Elevator algorithm will move towards 100 when it starts execution). Which algorithm will move the fewest tracks , SSTF or Elevator: , and by how many fewer tracks: tracks less than the other algorithm.Consider a disk queue with requests for I/O to blocks on Cylinders: 98 183 37 122 14 124 65 67 Consider SSTF (shortest seek time first) scheduling, the total number of head movements is, if the disk is initially 53. Select one: a.245 b.240 c.236 d.224Suppose a disk has N cylinders, numbered from 0 to P. At some time, the disk arm is at cylinder X, and there is a queue of disk access requests for cylinders R1, R2, R3, R4. Explain which Disk scheduling algorithm should be the best to be used between the following a) FIFO b) CSCAN c) SSTF d) FSCAN e) CLOOK N: B • • Choose any acceptable numeric numbers for N, P, X, R1, R2, R3 and R4 • • Plagiarism Will be penalized heavily
