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Consider a storage disk with 4 platters (numbered as 0, 1, 2 and 3), 200 cylinders (numbered as 0, 1, … , 199), and 256 sectors per track (numbered as 0, 1, … 255). The following 6 disk requests of the form [sector number, cylinder number, platter number] are received by the disk controller at the same time: [120, 72, 2], [180, 134, 1], [60, 20, 0], [212, 86, 3], [56, 116, 2], [118, 16, 1] Currently head is positioned at sector number 100 of cylinder 80, and is moving towards higher cylinder numbers. The average power dissipation in moving the head over 100 cylinders is 20 milliwatts and for reversing the direction of the head movement once is 15 milliwatts. Power dissipation associated with rotational latency and switching of head between different platters is negligible. The total power consumption in milliwatts to satisfy all of the above disk requests using the Shortest Seek Time First disk scheduling algorithm is ______ . 
Note -This was Numerical Type question.
  • a)
    45
  • b)
    80
  • c)
    85
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider a storage disk with 4 platters (numbered as 0, 1, 2 and 3), 2...
Head starts at 80.

Total Head movements in SSTF = (86-80) + (86-72) + (134-72) + (134-16) = 200 Power dissipated by 200 movements : P1 = 0.2 * 200 = 40 mW Power dissipated in reversing head direction once = 15 mW Number of time Head changes its direction = 3 Power dissipated in reversing head direction: P2 = 3 * 15 = 45 mW Total power consumption (in mW) is P1 + P2 = 40 mW + 45 mW = 85 mW So, answer is 85 
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Most Upvoted Answer
Consider a storage disk with 4 platters (numbered as 0, 1, 2 and 3), 2...
Given Information:
- Number of platters: 4
- Number of cylinders: 200
- Sectors per track: 256
- Disk requests: [120, 72, 2], [180, 134, 1], [60, 20, 0], [212, 86, 3], [56, 116, 2], [118, 16, 1]
- Current head position: Cylinder 80, Sector 100
- Average power dissipation for moving the head over 100 cylinders: 20mW
- Power dissipation for reversing head movement once: 15mW
- Rotational latency and platter switching power dissipation is negligible

Calculation:
1. Calculate the distance (number of cylinders) from the current head position to each requested cylinder.
2. Find the shortest seek time request and calculate the total power consumption.
3. Calculate power consumption for moving the head to fulfill the requests.

Distance Calculation:
- Request 1: 72 (distance: 8 cylinders)
- Request 2: 134 (distance: 54 cylinders)
- Request 3: 20 (distance: 60 cylinders)
- Request 4: 86 (distance: 6 cylinders)
- Request 5: 116 (distance: 36 cylinders)
- Request 6: 16 (distance: 64 cylinders)

Shortest Seek Time First:
- Shortest seek time request: Request 4 (distance: 6 cylinders)
- Total power consumption = 20mW (moving to cylinder 86) + 15mW (reversing direction) + 6 * 20mW (moving to cylinder 86) = 20 + 15 + 120 = 155mW
Therefore, the total power consumption to satisfy all disk requests using the Shortest Seek Time First algorithm is 155mW.
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Consider a storage disk with 4 platters (numbered as 0, 1, 2 and 3), 200 cylinders (numbered as 0, 1, … , 199), and 256 sectors per track (numbered as 0, 1, … 255). The following 6 disk requests of the form [sector number, cylinder number, platter number] are received by the disk controller at the same time: [120, 72, 2], [180, 134, 1], [60, 20, 0], [212, 86, 3], [56, 116, 2], [118, 16, 1] Currently head is positioned at sector number 100 of cylinder 80, and is moving towards higher cylinder numbers. The average power dissipation in moving the head over 100 cylinders is 20 milliwatts and for reversing the direction of the head movement once is 15 milliwatts. Power dissipation associated with rotational latency and switching of head between different platters is negligible. The total power consumption in milliwatts to satisfy all of the above disk requests using the Shortest Seek Time First disk scheduling algorithm is ______ .Note -This was Numerical Type question.a)45b)80c)85d)None of theseCorrect answer is option 'C'. Can you explain this answer?
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The average power dissipation in moving the head over 100 cylinders is 20 milliwatts and for reversing the direction of the head movement once is 15 milliwatts. Power dissipation associated with rotational latency and switching of head between different platters is negligible. The total power consumption in milliwatts to satisfy all of the above disk requests using the Shortest Seek Time First disk scheduling algorithm is ______ .Note -This was Numerical Type question.a)45b)80c)85d)None of theseCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Consider a storage disk with 4 platters (numbered as 0, 1, 2 and 3), 200 cylinders (numbered as 0, 1, … , 199), and 256 sectors per track (numbered as 0, 1, … 255). 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