Computer Architecture FEB 10

Question 1(10 Points)

What are the advantages of using a glass substrate for a magnetic disk?

Question 2 (10 Points)

Explain serpentine recording.

3.Explain the difference between a simple CAV system and a multiple zone recording system.

4.What differences between a CD and a DVD account for the larger capacity of the

DVD?

5.Consider a single-platter disk with the following parameters:

Rotation speed: 7200 rpm;
Number of tracks on one side of platter: 30,000
Number of sectors per track: 600;
Seek time: one ms for every hundred tracks traversed.
Assumption: Let the disk receive a request to access a random sector on a random track and assume the disk head starts at track 0.

What is the average seek time?

***Explain your reasoning and show your mathematical calculations on how you derived your answer

6.Consider a single-platter disk with the following parameters:

Rotation speed: 7200 rpm;
Number of tracks on one side of platter: 30,000
Number of sectors per track: 600;
Seek time: one ms for every hundred tracks traversed.
Assumption: Let the disk receive a request to access a random sector on a random track and assume the disk head starts at track 0.

What is the average rotational latency?

***Explain your reasoning and show your mathematical calculations on how you derived your answer

7.Consider a single-platter disk with the following parameters:

Rotation speed: 7200 rpm;
Number of tracks on one side of platter: 30,000
Number of sectors per track: 600;
Seek time: one ms for every hundred tracks traversed.
Assumption: Let the disk receive a request to access a random sector on a random track and assume the disk head starts at track 0.

What is the transfer time for a sector?

***Explain your reasoning and show your mathematical calculations on how you derived your answer

8.Consider a single-platter disk with the following parameters:

Rotation speed: 7200 rpm;
Number of tracks on one side of platter: 30,000
Number of sectors per track: 600;
Seek time: one ms for every hundred tracks traversed.
Assumption: Let the disk receive a request to access a random sector on a random track and assume the disk head starts at track 0.

What is the total average time to satisfy a request?

***Explain your reasoning and show your mathematical calculations on how you derived your answer

9.Consider a magnetic disk drive with 8 surfaces, 512 tracks per surface, and 64 sectors per track.

What is the disk capacity?

**Explain your reasoning and show your mathematical calculations on how you derived your answer

10.Consider a magnetic disk drive with 8 surfaces, 512 tracks per surface, and 64 sectors per track.

Sector size = 1 kB.
Average seek time = 8 ms,
Track-to-track access time = 1.5 ms,
Drive rotates at 3600 rpm.
Successive tracks in a cylinder can be read without head movement.
What is the average access time?
**Explain your reasoning and show your mathematical calculations on how you derived your answer

11. Consider a magnetic disk drive with 8 surfaces, 512 tracks per surface, and 64 sectors per track.

Assume this file is stored in successive sectors & tracks of successive cylinders, starting at sector 0, track 0, of cylinder i.

Estimate the time required to transfer a 5-MB file.

**Explain your reasoning and show your mathematical calculations on how you derived your answer

12. Consider a magnetic disk drive with 8 surfaces, 512 tracks per surface, and 64 sectors per track.

What is the burst transfer rate?

**Explain your reasoning and show your mathematical calculations on how you derived your answer

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