Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Suppose that we want to schedule disk requests on a disk containing 200 cylinders numbered from 0 to 199. The Disk requests to be addressed are 82,170,43,140,24,16,189. And the Read/Write arm is at 48, and it is also given that the disk arm should move "towards the larger value".

Q₁- Illustrate on a graph the total read/write head movement for the SCAN Disk scheduling algorithm.

Q2- Calculate the total overhead movement (total distance covered by the disk arm).

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