ras servicing the request o ack 120, and at the previous s for track 90. The pending of their arrival) are for trach

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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A disk has 200 tracks (numbered 0 through 199).
At a given time, it was servicing the request of
reading data from track 120, and at the previous
request, service was for track 90. The pending
requests (in order of their arrival) are for track
numbers.
30, 70, 115, 130, 110, 80, 20, 25
How many times will the head change its direction
for the disk scheduling policies SSTF (Shortest
Seek Time First) and FCFS (First Come First
Serve)
Transcribed Image Text:A disk has 200 tracks (numbered 0 through 199). At a given time, it was servicing the request of reading data from track 120, and at the previous request, service was for track 90. The pending requests (in order of their arrival) are for track numbers. 30, 70, 115, 130, 110, 80, 20, 25 How many times will the head change its direction for the disk scheduling policies SSTF (Shortest Seek Time First) and FCFS (First Come First Serve)
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