Operating System Mcqs

Page No. 88

Consider a disk queue with requests for I/O to blocks on cylinders.
98 183 37 122 14 124 65 67
Considering SSTF (shortest seek time first) scheduling, the total number of head movements is, if the disk head is initially at 53 is?


a224


b236


c245


d240


View Answer 236

Consider a disk queue with requests for I/O to blocks on cylinders.
98 183 37 122 14 124 65 67
Considering FCFS (first cum first served) scheduling, the total number of head movements is, if the disk head is initially at 53 is?


a600


b620


c630


d640


View Answer 640

If a process needs I/O to or from a disk, and if the drive or controller is busy then ____________


athe request will be placed in the queue of pending requests for that drive


bthe request will not be processed and will be ignored completely


cthe request will be not be placed


dnone of the mentioned



Whenever a process needs I/O to or from a disk it issues a ______________


asystem call to the CPU


bsystem call to the operating system


ca special procedure


dall of the mentioned



An unrecoverable error is known as _________


ahard error


btough error


csoft error


dnone of the mentioned


View Answer hard error

The scheme used in the above question is known as _______ or ________


asector sparing & forwarding


bforwarding & sector utilization


cbackwarding & forwarding


dsector utilization & backwarding



In SCSI disks used in high end PCs, the controller maintains a list of _________ on the disk. The disk is initialized during ________ formatting which sets aside spare sectors not visible to the operating system.


adestroyed blocks, high level formatting


bbad blocks, partitioning


cbad blocks, low level formatting


ddestroyed blocks, partitioning



Defective sectors on disks are often known as __________


agood blocks


bdestroyed blocks


cbad blocks


dnone of the mentioned


View Answer bad blocks

A disk that has a boot partition is called a _________


astart disk


bend disk


cboot disk


dall of the mentioned


View Answer boot disk

For most computers, the bootstrap is stored in ________


aRAM


bROM


cCache


dTertiary storage


View Answer ROM

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