This article was previously published under Q104781
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This information applies to both Microsoft DoubleSpace and MicrosoftDriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commandsand filenames.
SUBST does not correctly delete substituted drives when you are usingDoubleSpace.
For example, if you use SUBST as follows to create an E drive, youcannot correctly remove it:
SUBST E: C:\DOS
When you type SUBST E /D, the drive isnot deleted correctly.
Some programs (such as Microsoft Diagnostics [MSD]) still report thedrive is valid. If you attempt to access the drive from the MS-DOScommand prompt, you receive the message "Error reading drive E, Abort,Retry, Fail?" instead of the message "Invalid drive specification."
NOTE: This problem occurs only when you use a drive letter that isreserved for use by DoubleSpace. To determine which drives arereserved for use by DoubleSpace, type dblspace /list at the MS-DOS command prompt and then press ENTER.
To work around this situation, restart your computer.
Microsoft has confirmed this to be a problem in MS-DOS versions 6.0and 6.2. We are researching this problem and will post new informationhere in the Microsoft Knowledge Base as it becomes available.