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

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 Q103544


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.


Modification Type: Major Last Reviewed: 11/22/1999
Keywords: KB103544