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Microsoft KB Archive/105255

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Knowledge Base

Err Msg with Removable Media: Dblspace Cannot Mount Drive...

Article ID: 105255

Article Last Modified on 11/22/1999


  • Microsoft MS-DOS 6.2 Standard Edition

This article was previously published under Q105255


When you try to mount a DoubleSpace-compressed removable media disk, you receive the following error message:

Dblspace cannot mount drive <letter>: The <letter>:\Dblspace.000 file is not a valid compressed volume file. To fix it, type scandisk <letter>:\Dblspace.000 at the command prompt.

If you run ScanDisk, it will likely report no errors.


This problem occurs when the DoubleSpace-compressed removable media disk is write protected.


To work around this problem, remove the write protection from the removable media disk.


Microsoft has confirmed this to be a problem in MS-DOS DoubleSpace version 6.2. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: 6.20 Bernoulli floptical floppy diskette

Keywords: KB105255