Register

Applied Test Series

7,582 views
3 3 votes
A disk drive has 5000 cylinders,  numbered 0 to 4999.  The drive is serving a

request at cylinder 143 currently  and the previous  request was at 125. The disk I/O queue, in FIFO order, is

        86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130

Starting  from the current  head  position,  what is the total  distance  (in cylinders)  that the disk arm moves to satisfy all the pending  requests, for SCAN?

1 Answer

Best answer
5 5 votes

SCAN algorithm progresses in one direction till the very end and then changes direction and serves other requests left.

PS:

Ans:9769 

. There is a mistake in writing answer in the attached image

• selected by
Voting & Accepting an answer helps improve the community
← Previous · Applied Test SeriesNext → · Test Series: COA
← Previous in category · self-doubt operating...Next in category → · Memory Management
Position:
Show:

Related questions

3 3 votes
1 answers 1 answer
1.4k
1.4k views
LRU asked Nov 22, 2021
1,442 views
Applied Grand Test 2
Given a disk with 100 cylinders (0 to 99). Exactly one time unit is required to move the read/write head from one cylinder to the next. At time 0 the heads are at cylinde...
2 2 votes
2 answers 2 answers
972
972 views
LRU asked Oct 20, 2021
972 views
Applied Test Series
In a system SCAN, disk scheduling policy has been used. The number of tracks traversed by the head if the disk has 200 tracks and the requested tracks, in the order recei...
1 1 vote
1 1 answer
1.2k
1.2k views
ramakrushna asked Dec 22, 2021
1,239 views
Live Test Series Live: Applied
We are given a hard disk of 500 GB. The performance details are :• 5000 RPM rotation rate• 200 cylinders, numbered from 1 to 200• Takes 1 + (n/20) milliseconds to move he...