Answer to Question #246914 in Software Engineering for samii

Question

a) Briefly explain RAID technique. What is the purpose of RAID?

b) Consider a disk with a sector size of 512 bytes, block size of 2048 bytes, 1000 tracks per surface, 100 sectors per track and 3 single-sided platters. Average seek time is 2 msec. The disk is spinning at a speed of 2400 rpm. You need to store an Employee file which contains 2000 records which are in fixed-length format. An employee record is 1024 bytes. No record spans multiple blocks.

(i). How many Employee records can be stored in a block of the above disk?

(ii). How many Employee records can be stored in a single track?

(iii). How many cylinders are needed to store the entire Employee file?

(iv). What is the total time required to transfer a track of data from the above disk? Consider average seek time and average rotational delay.

(v). Assuming that the data in the above disk are stored using the Next Block concept, what would be the time taken to read the entire stock file from the disk.

Answer 1

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