Assume that we are using a hard disk with the following characteristics: Capacity 200 GB • Average seek time 7 msec Spindle speed 5,400 rpm • Bytes per sector 512 • Sectors per cluster 8 Sectors per track 250. Assume that we have a file of 100, 000 records. Each record has 256 bytes. Answer the following questions: 1. How much is the average rotational delay? 2. How many records can be stored in one sector? 3. How many clusters are needed for the file? 4. How much is the time for reading one track, including the seek time, the average rotational delay, and the transfer time? 5. 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? 6. 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? 7. 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?

Assume that we are using a hard disk with the following characteristics: Capacity 200 GB • Average seek time 7 msec Spindle speed 5,400 rpm • Bytes per sector 512 • Sectors per cluster 8 Sectors per track 250. Assume that we have a file of 100, 000 records. Each record has 256 bytes. Answer the following questions: 1. How much is the average rotational delay? 2. How many records can be stored in one sector? 3. How many clusters are needed for the file? 4. How much is the time for reading one track, including the seek time, the average rotational delay, and the transfer time? 5. 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? 6. 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? 7. 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?

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Assume that we are using a hard disk with the following
characteristics:
• Capacity 200 GB
Average seek time 7 msec
• Spindle speed 5,400 rpm
• Bytes per sector 512
Sectors per cluster 8
Sectors per track 250.
Assume that we have a file of 100, 000 records. Each record has 256 bytes. Answer the following
questions:
1. How much is the average rotational delay?
2. How many records can be stored in one sector?
3. How many clusters are needed for the file?
4. How much is the time for reading one track, including the seek time, the average rotational
delay, and the transfer time?
5. 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?
6. 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?
7. 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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