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Explain why SSTF scheduling tends to favor middle cylinders over the innermost and outermost cylinders.
The center of the disk is the location having the fewest average distance to all other tracks. Therefore the disk head tends to move away from the edges of the disk. Here is another way to think of it. The present location of the head divides the cylinders into two groups. If the head is not in the center of the disk and a latest request arrives, the new request is more likely to be in the group that contains the center of the disk; therefore, the head is more likely to move in that direction.
An operating system provides the environment within that programs are executed. Internally operating systems differ greatly in their makeup because they are organized along many di
is there any difference between the trap and interrupt??
Q. Why is it important to scale up system bus and device speeds as the CPU speed increases? Answer: Consider a system which carries out 50% I/O and 50% computes. Doubling-up
Q. We have stressed the require for an operating system to make efficient use of the computing hardware. When is it suitable for the operating system to forsake this principle and
Explain a working of file control block A file control block (FCB) has information about the file, containing ownership, permission, and location of the file contents. The log
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Q. State three merits of placing functionality in a device controller rather than in the kernel and State three disadvantages. Answer: Three advantages: Bugs are less probabl
Interrupts The hardware mechanism that enables a device to inform the CPU is called an interrupt. The basic interrupt mechanism works as follows. The CPU hardware has a wire kn
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Enhanced second-chance algorithm. When we increase the second-chance algorithm by considering both the reference bit and the modify bit as an order pair. We have the following
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