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Consider a magnetic disk with 1000 cylinders rotating at a speed of 7200 revolutions per minute. The sector size on the disk is 1024 bytes. Assume that requests for sectors arriving from the file system can be located anywhere on the disk with equal probability and the locations of the requested sectors are independent of each other. Under these assumptions, the average seek time is 7 milliseconds The transfer time per sector is

Consider a magnetic disk with 1000 cylinders rotating at a speed of 7200 revolutions per minute. The sector size on the disk is 1024 bytes. Assume that requests for sectors arriving from the file system can be located anywhere on the disk with equal probability and the locations of the requested sectors are independent of each other. Under these assumptions, the average seek time is 7 milliseconds The transfer time per sector is

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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Consider a magnetic disk with 1000 cylinders rotating at a speed of 7200 revolutions per minute. The sector size on the disk is 1024 bytes. Assume that requests for sectors arriving from the file system can be located anywhere on the disk with equal probability and the locations of the requested sectors are independent of each other. Under these assumptions, the average seek time is 7 milliseconds. The transfer time per sector is 0.01 milliseconds (i.e., the raw data rate is 100 Megabytes per second). What is the effective data rate (select the answer closest to your calculated throughput)? a, 90KBytes/sec b. 100KBytes/sec c. 90MBytes/sec d. 100MBytes/sec
Transcribed Image Text:Consider a magnetic disk with 1000 cylinders rotating at a speed of 7200 revolutions per minute. The sector size on the disk is 1024 bytes. Assume that requests for sectors arriving from the file system can be located anywhere on the disk with equal probability and the locations of the requested sectors are independent of each other. Under these assumptions, the average seek time is 7 milliseconds. The transfer time per sector is 0.01 milliseconds (i.e., the raw data rate is 100 Megabytes per second). What is the effective data rate (select the answer closest to your calculated throughput)? a, 90KBytes/sec b. 100KBytes/sec c. 90MBytes/sec d. 100MBytes/sec
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