KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q101240: DBLSPACE Msg: Drive X Already Has an Estimated Compression…

Article: Q101240
Product(s): Microsoft Disk Operating System
Version(s): MS-DOS:6.0,6.2,6.22
Operating System(s): 
Keyword(s): 
Last Modified: 22-NOV-1999

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft MS-DOS operating system versions 6.0, 6.2, 6.22 
-------------------------------------------------------------------------------

SUMMARY
=======

This information applies to both Microsoft DoubleSpace and Microsoft DriveSpace.
For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands and filenames.

When you have a DoubleSpace-compressed drive that is less than 25 percent full,
the DBLSPACE /RATIO command results in the following error message:

  DoubleSpace is examining drive <drive letter>.
  Drive <drive letter> already has an estimated compression ratio of nn.n
  to 1.

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).

MORE INFORMATION
================

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.

Additional query words: 6.00 % double space 6.20

======================================================================
Keywords          :  
Technology        : kbMSDOSSearch kbMSDOS622 kbMSDOS620 kbMSDOS600
Version           : MS-DOS:6.0,6.2,6.22

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.