DBLSPACE Msg: Drive X Already Has an Estimated Compression... (101240)
The information in this article applies to:
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q101240
This information applies to both Microsoft DoubleSpace and Microsoft
DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands
When you have a DoubleSpace-compressed drive that is less than 25
percent full, the DBLSPACE /RATIO command results in the following
If the drive is less than 25 percent full, you can set the estimated
compression ratio (ECR) manually, but DoubleSpace cannot set the ECR
equal to the actual compression ratio (ACR).
DBLSPACE /RATIO adjusts the ECR to the ACR, unless the DoubleSpace
drive is less than 25 percent full.
When a drive is less than 25 percent full, the data contained in it
may not be representative of the data the drive will eventually hold.
Therefore, on average, it is better to maintain a 2:1 compression
ratio until the drive is 25 percent full.
In some cases, if the ECR is set to a low value, the ratio is adjusted
when you run DBLSPACE /RATIO. However, if the ECR is then set to a high
value, the ratio is not adjusted because by setting the ECR higher,
the space used falls below 25 percent. Subsequent use of the DBLSPACE
/RATIO command results in the message noted above.
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