Microsoft KB Archive/106522

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DoubleSpace Drive: Make Directory Results in Zero Bytes Free

Article ID: 106522

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 Q106522

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.


After MS-DOS reports you have several kilobytes (K) free on a DoubleSpace-compressed drive (for example, 128K with a 2:1 estimated compression ratio [ECR]), creating a directory results in zero bytes free disk space.


DoubleSpace reserves some space when a compressed drive is nearly full. Specifically, when the free space in the compressed volume file drops below the 64K uncompressed boundary, DoubleSpace reserves the remaining space for its own use.

For example, if your ECR is 2.0:1 and you have 130K "free" on your drive, you really have 65K left in uncompressed sectors. After you create a directory taking 16 sectors (8K), you have less than 64K free and uncompressed space. As a result, DoubleSpace reserves the remaining space for itself and reports zero bytes free disk space.

Additional query words: 6.00 6.20 dir md mkdir small full cvf insufficient space available dblspace

Keywords: KB106522