There are many parameters that could be used to describe disk performance; among them are: number of bits per track disk capacity (in bits) number of disk surfaces rotational speed rotational latency transfer rate tracks per surface sectors per track blocks per track sectors per block seek time speed of disk arm block-read time number of blocks Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation. Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned. a) If you divide tracks into half as many blocks, then you double the read time for a block. b) If you double the number of bits per track, then you double the average rotational latency. c) If you double the rotational speed of the disk, then you halve the average rotational latency. d) If you double the number of sectors per block, then you halve the capacity of the disk.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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There are many parameters that could be used to describe disk performance; among them are:

number of bits per track	disk capacity (in bits)	number of disk surfaces
rotational speed	rotational latency	transfer rate
tracks per surface	sectors per track	blocks per track
sectors per block	seek time	speed of disk arm
block-read time	number of blocks

Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation.

Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned.

		a)	If you divide tracks into half as many blocks, then you double the read time for a block.
		b)	If you double the number of bits per track, then you double the average rotational latency.
		c)	If you double the rotational speed of the disk, then you halve the average rotational latency.
		d)	If you double the number of sectors per block, then you halve the capacity of the disk.

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