Computer Systems: A Programmer's Perspective (3rd Edition)
Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 6.1, Problem 6.3PP
Program Plan Intro

Given Information:

A sector in a disk has the following parameters:

ParameterValue
Rotational Value15000 RPM
Tavg seek8 ms
Average numbers of sectors or tracks500

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(c) Consider a hard disk with a transfer rate of 15 Mbytes/ second is constantly transfering data to memory using DMA. The processor runs at 1 GHz, and takes 200 and 650 dlock cycles to initiate and complete DMA transfer respectively. If the size of the transfer is 26 Kbytes, calculate the percentage of processor time consumed for the transfer operation.
Q2: According to the first principles and equations of a hard disk, answer the following branches: A) Derive an equation for rotational time (latency) of a hard disk in terms of variables of transfer time for n contiguous sectors, no. of passing n contiguous sectors that must be read, the total no. of sectors per track, and the rotation angle. B) Find the rotational angle in radians if the rotational speed is 7500 r.p.m, and 5 msec. average latency.
2. a. If a computer can have a maximum of 256MB of memory, how many address bits arerequired?   b. A disk drive has 4 double sided platters. Each surface has 400 tracks. Each track is dividedinto 50 sectors. There are 512 bytes in each sector. What is the capacity of each cylinder?What is the capacity of the disk drive?
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