Consider the bitmap representation of the free-space map, where for each block in the file, two bits are maintained in the bitmap. If the block is between 0 and 30 percent full the bits are 00, between 30 and 60 percent the bits are 01, between 60 and 90 percent the bits are 10, and above 90 percent the bits are 11. Such bitmaps can be kept in memory even for quite large files. Outline two benefits and one drawback to using two bits for a block, instead of one byte as described earlier in this chapter. Describe how to keep the bitmap up to date on record insertions and deletions. c     .Outline the benefit of the bitmap technique over free lists in searching for free space and in updating free space information.

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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  1. Consider the bitmap representation of the free-space map, where for each

block in the file, two bits are maintained in the bitmap. If the block is between

0 and 30 percent full the bits are 00, between 30 and 60 percent the bits are

01, between 60 and 90 percent the bits are 10, and above 90 percent the bits

are 11. Such bitmaps can be kept in memory even for quite large files.

  1. Outline two benefits and one drawback to using two bits for a block,

instead of one byte as described earlier in this chapter.

  1. Describe how to keep the bitmap up to date on record insertions and

deletions.

c     .Outline the benefit of the bitmap technique over free lists in searching

for free space and in updating free space information.

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