Operating system/Secondary memory and Disk scheduling Sample Test,Sample questions

Question: Consider a circular disk where tracks are numbered from 0 to 100, if we have a following request vector 4,34,10,19,73,89,17 If currently header at 22 and moving up,find the total head moment in order to satisfy this request using FCFS.

1.265

2.233

3.224

4.223


Question: Consider a circular disk where tracks are numbered from 0 to 100, if we have a following request vector 4,34,10,19,73,89,17 If currently header at 22 and moving up,find the total head moment in order to satisfy this request using C-Scan.

1.123

2.197

3.178

4.None of the above


Question: Consider a circular disk where tracks are numbered from 0 to 100, if we have a following request vector 4,34,10,19,73,89,17 If currently header at 22 and moving up,find the total head moment in order to satisfy this request using LOOK.

1.152

2.167

3.197

4.180


Question: Consider a circular disk where tracks are numbered from 0 to 100, if we have a following request vector 4,34,10,19,73,89,17 If currently header at 22 and moving up,find the total head moment in order to satisfy this request using Scan.

1.103

2.174

3.187

4.190


Question: Consider a circular disk where tracks are numbered from 0 to 100, if we have a following request vector 4,34,10,19,73,89,17 If currently header at 22 and moving up,find the total head moment in order to satisfy this request using SSTF.

1.103

2.174

3.123

4.223


Question: Consider a disk where each sector contain 256 bytes, each track contains 512 sectors and disk contain 64 tracks, what is the capacity of disk ?

1.256 KB

2.128 KB

3.8 MB

4.1 MB


Question: Consider a disk where each sector contain 64 bytes, each track contains 128 sectors and disk contain 1000 tracks, what is the capacity of disk ?

1.8MB

2.16MB

3.32MB

4.None of the above


Question: In double inter-leaving , the transfer time is become

1.3 times

2.2 times

3.2.75 time

4.remain constant


Question: In single inter-leaving, the transfer time is

1.double

2.triple

3.constant

4.varies according to header


Question: Time taken by read/write header to reach the correct track is -

1.Rotational latency

2.Seek time

3.Transfer time

4.None of the above


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