COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
3rd Edition
ISBN: 9780134671123
Author: Bryant
Publisher: PEARSON
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Chapter 6, Problem 6.24HW

Suppose that a 2 MB file consisting of 512-byte logical blocks is stored on a disk drive with the following characteristics:

Parameter Value
Rotational rate 15,000 RPM
Seek 4 ms
Average number of sectors/track 1,000
Surfaces 8
Sector size 512 bytes

  For each case below, suppose that a program reads the logical blocks of the file sequentially, one after the other, and that the time to position the head over the first block is Tavg seek + Tavg rotation.

  1. A.    Best case: Estimate the optimal time (in ms) required to read the file over all possible mappings of logical blocks to disk sectors.
  2. B.     Random case: Estimate the time (in ms) required to read the file if blocks are mapped randomly to disk sectors.
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