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ARTICLE-ID:Q94357
TITLE :Difference Between DEFRAG and DBLSPACE /DEFRAGMENT
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The information in this article applies to:
- Microsoft MS-DOS operating system version 6.0
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Summary:
There are two ways to defragment a DoubleSpace drive. You can run
DBLSPACE /DEFRAGMENT, or you can run Microsoft Defragmenter
(DEFRAG.EXE).
More Information:
Files stored on a DoubleSpace drive become fragmented just as they do
on a physical drive.
Microsoft Defragmenter (DEFRAG.EXE) makes files contiguous as far as
MS-DOS is concerned, so files are contiguous in virtual clusters. For
example, a DoubleSpace drive would go from
H:\DBLSPACE.000: [1213--542---132-2--113---4 ]
C: [1123156-1-13-5-1-2-3-1521--123------- ]
to this:
H:\DBLSPACE.000: [1213--542---132-2--113---4 ]
C: [111112222333344455556---------------- ]
NOTE: In these examples, each number represents a piece of a file.
For example, each 1 indicates a piece of file 1.
DBLSPACE /DEFRAGMENT moves data within the compressed volume file
(CVF), so that all the free space is at the end. Using the same
example, the file would go from
H:\DBLSPACE.000: [1213--542---132-2--113---4 ]
C: [1123156-1-13-5-1-2-3-1521--123------- ]
to this:
H:\DBLSPACE.000: [121354213221134----------- ]
C: [1123156-1-13-5-1-2-3-1521--123------- ]
If you type DEFRAG to defragment a DoubleSpace drive, Defragmenter
runs DBLSPACE /DEFRAGMENT when it has completed. Once both types of
defragmentation have been done, the sample file would look like this:
H:\DBLSPACE.000: [121354213221134----------- ]
C: [111112222333344455556---------------- ]
Note that files are contiguous on the virtual drive (drive C), but not
within the CVF--free space is contiguous in both places.
Additional reference words: 6.00