Assume that we are using a hard disk with the following characteristics: Capacity 30 GB Average seek time 6 msec Spindle speed 15,000 rpm Bytes per sector 512 Sectors per cluster 8 Sectors per track 400.Assume that we have a file of 20,000 records. Each record has 64 bytes. Answer the followingquestions:How much is the average rotational delay?How many records can be stored in one sector?How many clusters are needed for the file?How much is the time for reading one track, including the seek time, the averagerotational delay, and the transfer time?Assuming contiguous storage, namely, the records are stored in clusters from the sametrack as long as possible, how much is the total time for reading the whole file?Assuming the minimal transfer unit is one cluster, how much is the time for reading onecluster, including the seek time, the average rotational delay, and the transfer time?Assuming random storage of the records and every record is stored in a differentcluster, reading a cluster will include the seek time, the average rotational delay, andthe transfer time for that cluster, how much is the total time for reading the whole file?

Answer: 1) There is 15000 rotation in 60 seconds. 1 rotation in 60/15000 seconds. Half…

Answered: Assume that we are using a hard 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

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Assume that we are using a hard disk with the following characteristics:
 Capacity 30 GB
 Average seek time 6 msec
 Spindle speed 15,000 rpm
 Bytes per sector 512
 Sectors per cluster 8
 Sectors per track 400.
Assume that we have a file of 20,000 records. Each record has 64 bytes. Answer the following
questions:

How much is the average rotational delay?
How many records can be stored in one sector?
How many clusters are needed for the file?
How much is the time for reading one track, including the seek time, the average
rotational delay, and the transfer time?
Assuming contiguous storage, namely, the records are stored in clusters from the same
track as long as possible, how much is the total time for reading the whole file?
Assuming the minimal transfer unit is one cluster, how much is the time for reading one
cluster, including the seek time, the average rotational delay, and the transfer time?
Assuming random storage of the records and every record is stored in a different
cluster, reading a cluster will include the seek time, the average rotational delay, and
the transfer time for that cluster, how much is the total time for reading the whole file?

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