None A disk has 200 tracks (numbered 0 through 199).At a given time, it was servicing the request ofreading data from track 120, and at the previousrequest, service was for track 90. The pendingrequests (in order of their arrival) are for tracknumbers.30, 70, 115, 130, 110, 80, 20, 25How many times will the head change its directionfor the disk scheduling policies SSTF (ShortestSeek Time First) and FCFS (First Come FirstServe)

Answered: Image /qna-images/answer/6a8a35c8-350d-4ccb-8d20-4cdc3a8932d9.jpg

Answered: ras servicing the request o ack 120,…

Engineering

Computer Science

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

Problem 1PE

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Concept explainers

Storage Devices

Storage devices can store digital information/data and applications (in the form of audio, video, image, etc.) to process the result of any computational work. They are a kind of computer hardware that stores information and instruction to be processed. A storage unit is a part of a computer system. Every computer has a storage device. The storage devices work as a memory. They are also known as a storage medium, digital storage, or storage media, which temporarily or permanently store information. They are used either internally or externally in the computer system, server, or any computation device to hold the information. Examples include a pen drive, CD, DVD, floppy disk, memory card and so forth.

Question

None

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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