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Disk requests come into the disk driver for cylinders 10, 22, 20, 2, 40, 6, 38 (in that order). A seek takes 4.5 msec per cylinder. How much seek time is needed for each of the following, if the disk arm is initially at cylinder 39? A. First-come, first-served. B. Shortest-seek first. C. Elevator algorithm (initially moving upward).

Disk requests come into the disk driver for cylinders 10, 22, 20, 2, 40, 6, 38 (in that order). A seek takes 4.5 msec per cylinder. How much seek time is needed for each of the following, if the disk arm is initially at cylinder 39? A. First-come, first-served. B. Shortest-seek first. C. Elevator algorithm (initially moving upward).

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Disk requests come into the disk driver for cylinders 10, 22, 20, 2, 40, 6, 38 (in that order). A seek takes 4.5 msec per cylinder. How much seek time is needed for each of the following, if the disk arm is initially at cylinder 39? A. First-come, first-served. B. Shortest-seek first. C. Elevator algorithm (initially moving upward).
Transcribed Image Text:Disk requests come into the disk driver for cylinders 10, 22, 20, 2, 40, 6, 38 (in that order). A seek takes 4.5 msec per cylinder. How much seek time is needed for each of the following, if the disk arm is initially at cylinder 39? A. First-come, first-served. B. Shortest-seek first. C. Elevator algorithm (initially moving upward).
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