ECR Cannot Be Decreased Beyond a Certain Range (97671)

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 Q97671


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.

The estimated compression ratio (ECR) cannot be decreased beyond a certain range if a drive has become too fragmented.


This situation occurs when there is a large unused section in the file allocation table (FAT) and a used cluster exists at the very end. If you could reduce the ECR below the value DoubleSpace limits you to, the last cluster would be truncated by the edge of the new FAT table size.


To work around this problem, run Microsoft Defragmenter (Defrag) on your compressed drive.

Modification Type: Major Last Reviewed: 11/22/1999
Keywords: KB97671