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Recent questions tagged disk

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121

Disk Accessing
I solved this question correctly. I have a slight doubt though if say in question it says that Disk address is of K bits then what it represents 2^k Sectors or 2^k blocks ???

Na462 asked in Operating System Jul 12, 2018

by Na462

452 views

0 votes

0 answers

122

Difference between cylinder and tracks
I am getting confused with these two terms cylinder and tracks a) Is it cylinder = tracks ? b) How does addressing works in terms of surface and cylinder , track and sector https://gateoverflow.in/1337/gate2009-51

ejaz asked in Operating System Jun 13, 2018

by ejaz

230 views

0 votes

1 answer

123

Operating System
In a computer system, three files of size 11052 B, 4992 B and 5172 B need to be stored. For storing these files on disk, we can use either 100 B disk block or 200 B disk block. For each block used to store a file, 2 bytes of book ... data from a file, but not both. What is the total space required for storing the files using 100 B and 200 B disk blocks respectively___________

srestha asked in Operating System Jun 9, 2018

377 views

4 votes

5 answers

124

ISRO2018-23
Disk requests come to a disk driver for cylinders in the order $10$, $22$, $20$, $2$, $40$, $6$ and $38$ at a time when the disk drive is reading from cylinder $20$. The seek time is $6$ ms/cylinder. The total seek time, if the disk arm scheduling algorithms is first-come-first-served is $360$ $850$ $900$ None of the above

Arjun asked in Operating System Apr 22, 2018

by Arjun

3.7k views

2 votes

1 answer

125

ISRO2018-50
A particular disk unit uses a bit string to record the occupancy or vacancy of its tracks, with $0$ denoting vacant and $1$ for occupied. A $32$-$bit$ segment of this string has hexadecimal value D4FE2003. The percentage of occupied tracks for the corresponding part of the disk, to the nearest percentage is: $12$ $25$ $38$ $44$

Arjun asked in Operating System Apr 22, 2018

by Arjun

2.6k views

0 votes

1 answer

126

Data Transfer
I have a normal Doubt Consider a Scenario:- 1. Total number of block are = K Total number of records per block = P Size of record = B bytes And we need to transfer all the blocks in memory. Avg rotation latency = R Seek time = S Block transfer rate ... rotation latency and transfer time for every block rt? else in one access i can transfer everything??? Plz correct me if i am wrong?

Na462 asked in Operating System Mar 20, 2018

by Na462

275 views

44 votes

2 answers

127

GATE CSE 2018 | Question: 53
Consider a storage disk with $4$ platters (numbered as $0, 1, 2$ and $3$), $200$ cylinders (numbered as $0, 1, , 199$), and $256$ sectors per track (numbered as $0, 1, 255$). The following $6$ disk ... negligible. The total power consumption in milliwatts to satisfy all of the above disk requests using the Shortest Seek Time First disk scheduling algorithm is _____

gatecse asked in Operating System Feb 14, 2018

15.7k views

1 vote

0 answers

128

Ace Test Series: Operating System - Magnetic Tape Memory
How to solve this type??

rasto mapp asked in Operating System Jan 21, 2018

468 views

3 votes

0 answers

129

#Ace Test Series #Disk Transfer Rate
A disk unit has 20 recording surfaces. It has a total of 14,000 cylinders. There is an average of 400 sectors per track and each sector contains 512 bytes of data.Find the storage capacity of the disk unit. If disk rotates at a speed of ... by 20 or not ?There is nothing mentioned in the question about read/write heads so how to solve these type of questions?

rasto mapp asked in CO and Architecture Jan 15, 2018

331 views

2 votes

1 answer

130

self doubt
Is this formula ALWAYS correct? Average Disk Latency (in milliseconds) = 30000/RPM

Balaji Jegan asked in Operating System Jan 14, 2018

by Balaji Jegan

343 views

2 votes

0 answers

131

Disks
Consider the following requests to disk: 138,144,133,95,195,70,20,223,124 Assume the head is initially at 136 and algorithm used is SSTF then the number of times head has changed its direction excluding initial movement is _____________

Tuhin Dutta asked in Operating System Jan 7, 2018

528 views

0 votes

1 answer

132

MadeEasy Test Series: Operating System - Disks
A disk rotates at a speed of 3600 rpm. It has 4000 cylinders, 16 surface and 206 sectors per tracks. Track storage capacity is 2048 bytes. What is the average latency time (in msec) and data transfer rate (in kbps) respectively. A 16.66, 12.28 B 8.33, 196.48 C 16.66, 196.48 D 8.33, 12.28 Given answer is d, but i got 8.33 , 960Kbps

rahul sharma 5 asked in Operating System Dec 18, 2017

by rahul sharma 5

1.3k views

1 vote

2 answers

133

MadeEasy Test Series: Operating System - Disks
Consider linked allocation system, a program has just read the 15th disk block. After some point of time, If it next want to use the 20th block, then how many disk blocks must the program access? a: 5 b: 10 c:15 d:20

rahul sharma 5 asked in Operating System Dec 18, 2017

by rahul sharma 5

1.1k views

0 votes

1 answer

134

operating system disk scheduling
any shortcut method for this??

air1ankit asked in Operating System Dec 9, 2017

647 views

0 votes

1 answer

135

Self doubt on #seeks and #service requests in SSTF algo of Disks
Suppose cylinder head is at 100 currently. The queue of requests are : 30,85,90,100,105,110,135,145. SSTF is used. Find the #seeks required to service cylinder 90. Also, find #requests served before serving cylinder 90.

Tuhin Dutta asked in Operating System Dec 1, 2017

430 views

0 votes

0 answers

136

Doubt on sector address of Disks
Lets #surfaces = 16, #sectors = 64 and size of each sector = 512 B Given address is <1200,9,40>. This address means _______________________th sector. ans: [( 1200*16*64 + 9*64 + 40 ) - 1 ]th sector = 1229415 th sector [ since sector starts from 0 ] Am I correct?

Tuhin Dutta asked in Operating System Dec 1, 2017

319 views

1 vote

2 answers

137

Disks
Consider a magnetic disk containing 400 sectors per track. An application needs to read 100 randomly scattered sectors for loading the libraries at start up. Reading each sector requires exactly one disk access. The average seek time of the disk to a random location is ... Rotational speed of the disk is 6000 rpm. How long does it take to load libraries at start up to run the application?

thehobo03 asked in CO and Architecture Nov 30, 2017

1.1k views

2 votes

1 answer

138

average time to read data
Consider a disk system, which has a track seek time of t seek = 10ms (mini-second). The disk rotation speed is r = 9000 rpm (round per minute), and each track on the disk has S=600 sectors, each sector has total B=512 bytes data. What is the average time (in ms) it takes to read 1024 bytes data? (correct to three decimal places)

Parshu gate asked in CO and Architecture Nov 11, 2017

1.2k views

1 vote

1 answer

139

Previous year gate question modification(disks)
Consider a hard disk with 16 recording surfaces (1-16) having 16384 cylinders (1-16384) and each cylinder contains 64 sectors (1-64). Data storage capacity in each sector is 512 bytes. Data are organized cylinder-wise and the addressing ... on.. Please the tell me the <cylinder no,surfaceno, sector no> of last sector in this case. Thanks.

Rajesh R asked in CO and Architecture Nov 2, 2017

864 views

3 votes

1 answer

140

Hard disk
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. Consider the following statements : S1:The data transfer rate of the drive is 6400KBPs S2:The time required to read 800 random sectors is 4.13 sec S3:The time required to read 800 successive sectors is 0.0052 sec The number of statements is/are true _______.

shivangi5 asked in Operating System Oct 27, 2017

2.4k views

1 vote

0 answers

141

Testbook Test Series: Operating System - Disks
Given a file of 100 blocks, what is the minimum number of disk I/O operation to insert a block in the middle of the file if contiguous allocation is used (assume blocks to be inserted already in memory)? A) 2 B) 52 C)101 D)151

Shivam Chauhan asked in Operating System Oct 25, 2017

by Shivam Chauhan

665 views

1 vote

1 answer

142

Disks
A certain hard disk rotates at 6000 rpm. It has 1 KB per sector and 64 sectors/track and has a seek time of 5 msec. Find the time required to read: i. 800 successive sectors? ii. 800 random sectors?

Tuhin Dutta asked in Operating System Oct 8, 2017

1.5k views

1 vote

0 answers

143

HARD DISK
Is it is right to write Disk capacity = Ncylinder × Ccylinder or we have to multiply by the number of surfaces also ie.Disk Capacity= no. of surfaces x Ncylinder × Ccylinder where Ncylinder=no.of cylinder Ccylinder=capacity of cylinder

shivangi5 asked in CO and Architecture Sep 28, 2017

275 views

0 votes

1 answer

144

hamacher
A disk has 24 recording surfaces ,it has a total of 14,000 cylinders.there is an average of 400 sectors per track.Each sector contain 512 bytes of data a) using a 32 bit word suggest a suitable scheme for specifying the disk address.Assuming that there are 512 bytes per sector

set2018 asked in CO and Architecture Aug 26, 2017

409 views

1 vote

1 answer

145

made easy work book
the head of a movin disk with 100 tracks numbered 0 to 99 is serving a request at track 'x' if the requests of track 25, 76, 43,10,67 are served using fifo algo. then head movements are 194 the track 'x' initially served was.?

aaru14 asked in Operating System Aug 20, 2017

by aaru14

2.7k views

2 votes

1 answer

146

disk and address
A hard disk has 64 sectors/ track, 16 platters, each with 2 regarding surface and 2000 cylinders. The address of a sector is given as <c, h, s> where c → cylinder no., h → surface no., s → sector no. 0th sector is addressed as <0, 0, 0>. The address <500, 20, 32> corresponds to sector number is ??

Sunil8860 asked in CO and Architecture Aug 6, 2017

879 views

1 vote

1 answer

147

Secondary memory

learner_geek asked in CO and Architecture Jul 27, 2017

by learner_geek

1.3k views

0 votes

1 answer

148

Hard Disk Data Storage
How data is stored in hard disk? Is it cylinder by cylinder,like fill first cylinder and then next or is it surface by surface?

rahul sharma 5 asked in CO and Architecture May 24, 2017

by rahul sharma 5

1.4k views

0 votes

1 answer

149

DISK Data Transfer Rate
A disk unit has 20 recording surfaces. It has a total of 14,000 cylinders. There is an average of 400 sectors per track and each sector contains 512 bytes of data. Find the storage capacity of the disk unit. If disk rotates at a speed of 7200 rpm ... is not multipled with 20 but most of the questions in Go i have seen which multiplies it with no. of surfaces.Please clarify?

rahul sharma 5 asked in CO and Architecture May 22, 2017

by rahul sharma 5

1.5k views

3 votes

2 answers

150

[COA] Hard disk data transfer rate
Consider a disk pack with following specifications - 16 platters, 128 tracks/surface, 256 sector/track and 512Bytes/sector. Now, the disk is rotating at 9200RPM, what is the disk data transfer rate. in KBPS and MBPS?

rahul sharma 5 asked in CO and Architecture May 21, 2017

by rahul sharma 5

1.2k views

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Recent questions tagged disk