GATE - 2007 | OS | The head of a hard disk serves requests following the shortest seek

GATE - 2007 | OS | The head of a hard disk serves requests following the shortest seek
Posted on 17-02-2022

GATE - 2007 [Operating System]

Question:

The head of a hard disk serves requests following the shortest seek time first (SSTF) policy. The head is initially positioned at truck number 180. Which of the request sets will cause the head to change its direction after servicing every request assuming that the head does not change direction if there is a tie in SSTF and all the requests arrive before the servicing starts?

A

11, 139, 170, 178, 181, 184, 201, 265

B

10, 138, 170, 178, 181, 185, 201, 265

C

10, 139, 169, 178, 181, 184, 201, 265

D

10, 138, 170, 178, 181, 185, 200, 265

   

Solution:

Option (B) is Correct.

The head of a hard disk serves requests following the shortest seek time first (SSTF) policy. The head is initially positioned at truck number 180. Which of the request sets will cause the head to change its direction after servicing every request assuming that the head does not change direction if there is a tie in SSTF and all the requests arrive before the servicing starts?

Hence, correct option is (B).

Thank You

Download App for Free PDF Download

GovtVacancy.Net Android App: Download

government vacancy govt job sarkari naukri android application google play store https://play.google.com/store/apps/details?id=xyz.appmaker.juptmh