Assume that a hard disk has the following characteristics: Rotation speed = 7,200 rev/min Arm movement time = 0.5 msec fixed startup time + 0.05 msec for each track crossed. (The startup time is a constant no matter how far the arm moves.) Assume on average the disk arm must move 150 tracks. Number of surfaces = 2 (This is a double-sided disk. A single read/write arm holds both read/write heads.) Number of tracks per surface = 500 Number of sectors per track = 20 Number of characters per sector = 1,024 a. How many characters can be stored on this disk? b. What are the best-case, worst-case, and average-case access times for this disk?

Assume that a hard disk has the following characteristics: Rotation speed = 7,200 rev/min Arm movement time = 0.5 msec fixed startup time + 0.05 msec for each track crossed. (The startup time is a constant no matter how far the arm moves.) Assume on average the disk arm must move 150 tracks. Number of surfaces = 2 (This is a double-sided disk. A single read/write arm holds both read/write heads.) Number of tracks per surface = 500 Number of sectors per track = 20 Number of characters per sector = 1,024 a. How many characters can be stored on this disk? b. What are the best-case, worst-case, and average-case access times for this disk?

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter5: Data Storage Technology

Section: Chapter Questions

Problem 8RQ

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