Recent questions tagged disk / GATE Overflow for GATE CSE

1 votes

1 answer

151

Test by Bikram | Mock GATE | Test 4 | Question: 49
Consider a disk with these parameters: Number of surfaces $= 32$ Number of tracks / surface $= 64$ Number of sectors / track $= 1024$ Number of bytes stored in a bit serial manner in a sectors $= 256$ Let the capacity of the ... required to specify a particular sector in that disk be $`M'$ bits. The value of $L+5M$, therefore, is __________.

Consider a disk with these parameters:Number of surfaces $= 32$Number of tracks / surface $= 64$Number of sectors / track $= 1024$Number of bytes stored in a bit serial m...

Bikram

340 views

Bikram asked May 14, 2017

0 votes

1 answer

152

disk scheduling
when and why is disk scheduling used? also who performs disk scheduling?

when and why is disk scheduling used? also who performs disk scheduling?

iarnav

253 views

iarnav asked Apr 29, 2017

0 votes

2 answers

153

Is Disk Scheduling topic in OS is in syllabus?
Hello guys, I'm seeing a lot of questions on disk scheduling asked by various folks, but in GATE CS syllabus of OS - there's no topic as disk scheduling. So, please point me to the right direction where's the disk, sector seek time questions are coming?!

Hello guys, I'm seeing a lot of questions on disk scheduling asked by various folks, but in GATE CS syllabus of OS - there's no topic as disk scheduling. So, please point...

iarnav

1.4k views

iarnav asked Apr 10, 2017

3 votes

2 answers

154

Test by Bikram | Mock GATE | Test 2 | Question: 31
Consider the disk drive with the following specification: $16$ surfaces, $1024$ tracks/surface, $1024$ sectors/track, $1KB/sector$, rotation speed is $3000 rpm$ and the disk is operated in burst Mode. The processor runs at ... the size of transferred data is $20KB$. The percentage of processor time consumed for the transfer operation is ________.

Consider the disk drive with the following specification:$16$ surfaces, $1024$ tracks/surface, $1024$ sectors/track, $1KB/sector$, rotation speed is $3000 rpm$ and the di...

Bikram

1.2k views

Bikram asked Jan 24, 2017

2 votes

1 answer

155

Test by Bikram | Mock GATE | Test 2 | Question: 22
A certain hard drive rotates at $6000$ $rpm$. It has $1 KB$ per sector and averages $128$ sectors per track. Consider the following statements: The average latency of the drive is under $6$ $milliseconds$. The burst data rate of the drive is ... . Which of the above statements is/are true? II and III only I, II, and III I and II only II only

A certain hard drive rotates at $6000$ $rpm$. It has $1 KB$ per sector and averages $128$ sectors per track.Consider the following statements:The average latency of the d...

Bikram

505 views

Bikram asked Jan 24, 2017

2 votes

2 answers

156

Operating System Concepts, 7th Edition, Q12.2
Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 143, and the previous request was at cylinder 125. The queue of pending requests, in FIFO order, is: 86,1470, 913 ... , what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for C-SCAN?

Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4999. Thedrive is currently serving a request at cylinder 143, and the previousrequest was at cylinder 125. T...

ਜਗਮੀਤ

5.7k views

ਜਗਮੀਤ asked Jan 20, 2017

2 votes

1 answer

157

Test by Bikram | Mock GATE | Test 1 | Question: 55
Consider a disk with a sector size of $512$ bytes, $50$ sectors per track, $2000$ tracks per surface and five double-sided platters (i.e. $10$ surfaces). The disk platters rotate at $5400$ ... on this disk, and no record is allowed to span two blocks. Then, the rotational latency of the disk is ________ seconds.

Consider a disk with a sector size of $512$ bytes, $50$ sectors per track, $2000$ tracks per surface and five double-sided platters (i.e. $10$ surfaces). The disk platter...

Bikram

1.6k views

Bikram asked Jan 16, 2017

3 votes

3 answers

158

Test by Bikram | Mock GATE | Test 1 | Question: 26
Suppose we have a block-addressable disk drive. With such block organized disk non data overhead of subblocks and, interblock gaps have to be accounted for. There are $40,000$ bytes per track and the amount of space taken up by subblocks ... to the stored in each block in a file. A block is organized to hold an integral number of logical records.

Suppose we have a block-addressable disk drive. With such block organized disk non data overhead of subblocks and, interblock gaps have to be accounted for.There are $40,...

Bikram

998 views

Bikram asked Jan 16, 2017

0 votes

0 answers

159

[Doubt] William Stallings Computer Organization Chapter 6,P-187,External Memory
A bit near the center of a rotating disk travels past a fixed point (such as a read-write head) slower than a bit on the outside. Therefore, some way must be found to compensate for the variation in speed ... disk at a fixed speed, known as the constant angular velocity (CAV). Please help me understanding the Bold part

A bit near the center of a rotating disk travels past a fixed point (such as aread–write head) slower than a bit on the outside. Therefore, some way must befound to com...

rahul sharma 5

529 views

rahul sharma 5 asked Jan 3, 2017

3 votes

1 answer

160

MadeEasy Subject Test: Operating System - Disks
Consider a typical disk that rotates at 30000 rotations per minute(RPM) and has a transfer rate of 40Mbps.If the average seek time of the disk is twice the average rotational delay and the controller's transfer time is 8 times the ... following way-: time taken=seek time+rotational latency+transfer time+controller time =2+1+0.0512+0.4096 =3.4608

Consider a typical disk that rotates at 30000 rotations per minute(RPM) and has a transfer rate of 40Mbps.If the average seek time of the disk is twice the average rotati...

sourojit

1.5k views

sourojit asked Dec 26, 2016

0 votes

0 answers

161

Disk Transfer Time Calculation
Could some one please guide what should be the conversion units when calcuating Disk Transfer time and Transmission time? For disk transfer time I have noticed that in many solutions powers of 10 and 2 are interchangeably used based on ... type( floppy, hard disk etc) https://en.wikipedia.org/wiki/Binary_prefix https://en.wikipedia.org/wiki/Data_rate_units

Could some one please guide what should be the conversion units when calcuating Disk Transfer time and Transmission time? For disk transfer time I have noticed that in ma...

yg92

662 views

yg92 asked Dec 9, 2016

1 votes

1 answer

162

os question
Consider the following statements: 1. Paging suffers from internal fragmentation and segmentation suffers from external fragmentation. 2. FIFO replacement policy ignores locality of reference. 3. The essential content(s) in each entry of page table are both virtual page number and page ... Which of the above statements are correct? Only 3 and 4 Only 2 and 3 Only 1 and 4 Only 1 and 2

Consider the following statements:1. Paging suffers from internal fragmentation and segmentation suffers from external fragmentation.2. FIFO replacement policy ignores lo...

Vishal Goyal

3.6k views

Vishal Goyal asked Dec 4, 2016

0 votes

1 answer

163

Test by Bikram | Computer Organization and Architecture | Test 1 | Question: 14
A disk has $20$ sectors per track. Assume there are $512$ bytes per sector. What is the data transfer rate (in bytes per second) at a rotational speed of $7200$ rpm? $1.26 * 10^8$ bytes/second $1.58 * 10^6$ bytes/second $1.318 * 10^5$ bytes/second $1.2288 * 10^6$ bytes/second

A disk has $20$ sectors per track. Assume there are $512$ bytes per sector. What is the data transfer rate (in bytes per second) at a rotational speed of $7200$ rpm?$1.26...

Bikram

392 views

Bikram asked Nov 25, 2016

16 votes

2 answers

164

GATE CSE 1990 | Question: 7-c
A certain moving arm disk-storage device has the following specifications: Number of tracks per surface $= 404$ Track storage capacity $=130030$ bytes. Disk speed $=3600$ rpm Average seek time $=30$ m secs. Estimate the average latency, the disk storage capacity, and the data transfer rate.

A certain moving arm disk-storage device has the following specifications:Number of tracks per surface $= 404$Track storage capacity $=130030$ bytes.Disk speed $=3600$ rp...

makhdoom ghaya

8.1k views

makhdoom ghaya asked Nov 23, 2016

3 votes

2 answers

165

MadeEasy Test Series: Operating System - Disks
A certain hard disk rotates at 6000 rpm. It has 1 KB per sector and average 64 sectors/track and has a seek time of 5 msec. Which of the following statements is/are true? S1 : The data transfer rate of the drive is 6400 KBPs. S2 : The ... S3 : The time required to read 800 successive sectors is 0.0052 sec. Only S1 and S2 Only S2 and S3 Only S2 Only S1

A certain hard disk rotates at 6000 rpm. It has 1 KB per sector and average 64 sectors/track and has a seek time of 5 msec. Which of the following statements is/are true?...

Pankaj Joshi

1.5k views

Pankaj Joshi asked Nov 19, 2016

1 votes

1 answer

166

Time required to read 800 successive sectors ?
A certain hard disk rotates at 6000 rpm. It has 1KB per sector and 64 sectors per track and has a seek time of 5ms. The time required to read 800 successive sectors is? 800 successive sectors means 12 complete tracks and 32 sectors of the 13th track. (this is not random 800 sectors that we can just multiply by 800 , with tseek+trot+ttrans).

A certain hard disk rotates at 6000 rpm. It has 1KB per sector and 64 sectors per track and has a seek time of 5ms. The time required to read 800 successive sectors is?80...

prasitamukherjee

946 views

prasitamukherjee asked Nov 16, 2016

3 votes

1 answer

167

Disk capacity
Assume innermost track has diameter 1 cm and outermost track has diameter 10 cm. There are 10 tracks in the disk and it is rotating with constant linear velocity. Capacity of innermost track is 1MB. Total capacity of the disk is ____ ?

Assume innermost track has diameter 1 cm and outermost track has diameter 10 cm. There are 10 tracks in the disk and it is rotating with constant linear velocity. Capacit...

Rakesh K

1.7k views

Rakesh K asked Nov 13, 2016

1 votes

1 answer

168

Os+ disk+ntpel question
Disk cache have cache access not in heiracrchially manner by default?? I am getting 76 as answer

Disk cache have cache access not in heiracrchially manner by default?? I am getting 76 as answer

Rahul Jain25

493 views

Rahul Jain25 asked Oct 25, 2016

0 votes

1 answer

169

UGC NET CSE | June 2011 | Part 2 | Question: 36
Block or Buffer caches are used to Improve disk performance Handle interrupts Increase the capacity of main memory Speed up main memory Read operations

Block or Buffer caches are used toImprove disk performanceHandle interruptsIncrease the capacity of main memorySpeed up main memory Read operations

makhdoom ghaya

847 views

makhdoom ghaya asked Aug 30, 2016

2 votes

1 answer

170

Sector Interleaving - MCQs in CS - Timothy Williams
Sector interleaving in disks is done by a) the disk manufacturer b) the disk controller cord c) the os d) none of the above

Sector interleaving in disks is done bya) the disk manufacturerb) the disk controller cordc) the osd) none of the above

Sankaranarayanan P.N

3.4k views

Sankaranarayanan P.N asked Aug 23, 2016

2 votes

1 answer

171

UGC NET CSE | December 2015 | Part 2 | Question: 28
Consider a disk with 16384 bytes per track having a rotation time of 16 msec and average seek time of 40 msec. What is the time in msec to read a block of 1024 bytes from this disk? 57 msec 49 msec 48 msec 17 msec

Consider a disk with 16384 bytes per track having a rotation time of 16 msec and average seek time of 40 msec. What is the time in msec to read a block of 1024 bytes from...

go_editor

4.9k views

go_editor asked Aug 8, 2016

0 votes

1 answer

172

Disk Scheduling
The time to access the first word of a specific sector of a hard disk depends on rotational speed of the disk, the average seek time and the no. of sector per track.if we want not just the first word but the entire sector(assume a sector holds about 100 words).How much ... take? a)100 times longer b)10 times longer c)same amount of time d)50 times longer //Is the answer a) OR c)..

The time to access the first word of a specific sector of a hard disk depends on rotational speed of the disk, the average seek time and the no. of sector per track.if we...

Smriti Changulani

1.6k views

Smriti Changulani asked Jul 18, 2016

0 votes

1 answer

173

which raid level gives block level striping with double distributed parity
which raid level gives block level striping with double distributed parity a) raid 10 b) raid 2 c) raid 6 d) raid 5

which raid level gives block level striping with double distributed paritya) raid 10b) raid 2c) raid 6d) raid 5

Anuanu

2.3k views

Anuanu asked Jun 23, 2016

5 votes

5 answers

174

ISRO2011-38
A fast wide SCSI-II disk drive spins at 7200 RPM, has a sector size of 512 bytes, and holds 160 sectors per track. Estimate the sustained transfer rate of this drive 576000 Kilobytes / sec 9600 Kilobytes / sec 4800 Kilobytes / sec 19200 Kilobytes / sec

A fast wide SCSI-II disk drive spins at 7200 RPM, has a sector size of 512 bytes, and holds 160 sectors per track. Estimate the sustained transfer rate of this drive57600...

go_editor

4.7k views

go_editor asked Jun 22, 2016

7 votes

2 answers

175

ISRO2007-56
Which of the following RAID level provides the highest Data Transfer Rate (Read/Write) RAID 1 RAID 3 RAID 4 RAID 5

Which of the following RAID level provides the highest Data Transfer Rate (Read/Write)RAID 1RAID 3RAID 4RAID 5

go_editor

4.0k views

go_editor asked Jun 10, 2016

7 votes

3 answers

176

ISRO2007-39
Disk requests are received by a disk drive for cylinder 5, 25, 18, 3, 39, 8 and 35 in that order. A seek takes 5 msec per cylinder moved. How much seek time is needed to serve these requests for a Shortest Seek First (SSF) algorithm? Assume that the arm is at cylinder 20 when the last of these requests is made with none of the requests yet served 125 msec 295 msec 575 msec 750 msec

Disk requests are received by a disk drive for cylinder 5, 25, 18, 3, 39, 8 and 35 in that order. A seek takes 5 msec per cylinder moved. How much seek time is needed to ...

go_editor

6.3k views

go_editor asked Jun 10, 2016

4 votes

3 answers

177

ISRO2009-36
Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stores in a bit serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk are respectively 256 Mbyte, 19 bits 256 Mbute, 28 bits 512 Mbyte, 20 bits 64 Gbyte, 28 bits

Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stores in a bit serial manner in a sector. The capacity of ...

Desert_Warrior

8.3k views

Desert_Warrior asked Jun 3, 2016

1 votes

2 answers

178

UGC NET CSE | June 2013 | Part 3 | Question: 64, UGCNET-Dec2015-II: 49
A UNIX file system has 1 KB block size and 4-byte disk addresses. What is the maximum file size if the inode contains ten direct block entries, one single indirect block entry, one double indirect block entry and one triple indirect block entry? 30 GB 64 GB 16 GB 1 GB

A UNIX file system has 1 KB block size and 4-byte disk addresses. What is the maximum file size if the inode contains ten direct block entries, one single indirect block ...

Sanjay Sharma

8.0k views

Sanjay Sharma asked May 31, 2016

0 votes

2 answers

179

Avg. disk access time.
What is the average access time for transferring 512 bytes of data with the following specification : Avg. seek time = 5ms Disk Rotation = 6000rpm, 40kbps Controller Overhead = 0.1ms

What is the average access time for transferring 512 bytes of data with the following specification :Avg. seek time = 5msDisk Rotation = 6000rpm, 40kbpsController Overhea...

$ourav

6.0k views

$ourav asked May 18, 2016

3 votes

4 answers

180

ISRO-2013-52
Suppose we have variable logical records of lengths of $5$ bytes, $10$ bytes and $25$ bytes while the physical block size in disk is $15$ bytes. What is the maximum and minimum fragmentation seen in bytes? $25$ and $5$ $15$ and $5$ $15$ and $0$ $10$ and $5$

Suppose we have variable logical records of lengths of $5$ bytes, $10$ bytes and $25$ bytes while the physical block size in disk is $15$ bytes. What is the maximum and m...

makhdoom ghaya

7.7k views

makhdoom ghaya asked May 2, 2016

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