Question

Describe the structure of a disk in an operating system and explain the concept of disk scheduling. Compare the FCFS, SSTF, and SCAN scheduling algorithms. Provide an example to demonstrate the working of these algorithms.

10 Feb 2025
Answer :
Word Count : 501

A disk in an operating system consists of multiple platters, each having two surfaces coated with a magnetic material. Data is stored in concentric circles known as tracks, which are further divided into smaller units called sectors. A group of tracks at the same position across multiple platters forms a cylinder. The disk has a read/write head that moves across the tracks to access data, and these heads are attached to a single moving arm, making it necessary to move them in unison.

Disk scheduling is the process of determining the order in which disk I/O requests are processed to optimize performance. Since the disk arm takes time to move between tracks, efficient scheduling is essential to minimize seek time and improve overall system responsiveness. _________ ____ ________ ________ __________ _____ ________ ___ _________.
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