Microsoft KB Archive/103544

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DIR /C Fails to Report File Compression Ratio

Article ID: 103544

Article Last Modified on 11/22/1999


  • Microsoft MS-DOS 6.0 Standard Edition
  • Microsoft MS-DOS 6.2 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition

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.


Additional query words: MWBackup 6.00 6.20

Keywords: KB103544