Recent questions tagged disk-scheduling

The designer of an operating system noticed, after performance measurements, that the system presented disk access problems, with a very high average waiting time. Select...

A magnetic-disk head is currently at cylinder : $100$Pending requests are:$120,\ 90,\ 70,\ 80,\ 140,\ 110,\ 60$The scheduling method follows these rules:requests may be r...

Which of the following statements about magnetic-disk arm scheduling is incorrect?FCFS handles requests according to arrival order and is considered fair, although it gen...

Consider the following statement:If disk requests are scheduled using SSTF, the seek time will increase compared with FCFS. Furthermore, the elevator algorithm is not rec...

A disk has $200$ tracks numbered $0$ through $199$.The disk head is currently at track $:184$Disk requests arrive for:$184,\ 187,\ 176,\ 182,\ 199$If SSTF scheduling is u...

Suppose a disk repeatedly services requests for one particular track while requests for other tracks remain unserved. This phenomenon is called disk-arm sticking.Which of...

Which disk scheduling algorithm selects the pending request requiring the smallest movement of the disk arm from its current position, thereby choosing the minimum seek t...

A disk contains tracks numbered from $0$ through $199$.The disk head is currently at track $184$.The pending requests, in arrival-list order, are $184, 187, 176, 182, 199...

In a magnetic surface memory, an 8 KB file is stored in the consecutive sectors in the same track. Let each sector capacity be 0.25 KB and the file starting sector number...

Consider the following disc Queue with requests for I/O to block on cylinders:$45,81,185,33,175,99,150,77$(Consider that the head starts from location $58$)What shall be ...

Consider the following disc Queue with requests for I/O to block on cylinders:$45,81,185,33,175,99,150,77$(Consider that the head starts from location $58$)What will be t...

Consider the following disc Queue with requests for I/O to block on cylinders:$45,81,185,33,175,99,150,77$(Consider that the head starts from location $58$)What shall be ...

Consider the following disc Queue with requests for I/O to block on cylinders:$45,81,185,33,175,99,150,77$(Consider that the head starts from location $58$)What shall be ...

Consider the following disc Queue with requests for I/O to block on cylinders :$ 45,81,185,33,175,99,150,77$(Consider that the head starts from location $58$)What shall b...

Match List - I with List - II.$\begin{array}{|ll|ll|} \hline & \textbf{List - I} && \textbf{List-II} \\ & \textbf{(operating system concepts)} && \textbf{(characteristics...

Consider the following requests to read data from cylinders of a hard drive, where the current position of the head is at cylinder $73$ and the head is moving towards cyl...

At a particular point in time, the buffer cache has dirty data that needs to be flushed to disk. Suppose that the identities of these blocks can be listed in [track:secto...

Find seek time using FCFS,SSTF, SCAN.C-SCAN, LOOK for the following string98, 183, 37, 122, 14, 124, 65, 67Assume that request queue (0-199).and Head pointer 53

Consider a disk system with cylinders. The request to access the cylinders occurs in the following sequence:\[4,34,10,7,19,73,2,15,6,20\]Assuming that the head is current...

Consider an operating system capable of loading and executing a single sequential user process at a time. The disk head scheduling algorithm used is first come first serv...