DIR /C Fails to Report File Compression Ratio (103544)

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.

The DIR /C command does not report a compression ratio for a file if one of the following is true:

• The Microsoft DoubleSpace FAT (MDFAT) is damaged.
• The file is open in another Windows virtual machine (VM), and the MDFAT has not been updated.
• The file was created by Microsoft Backup (or Microsoft Backup for Windows).

To work around this problem, check the file compression ratio in File Manager or run ScanDisk.

NOTE: The fact that a file does not have a compression ratio does not affect the ability of DoubleSpace to calculate an actual compression ratio (ACR) for the whole drive.