This information applies to both Microsoft DoubleSpace and Microsoft
DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands
SUBST does not correctly delete substituted drives when you are using
For example, if you use SUBST as follows to create an E drive, you
cannot correctly remove it:
SUBST E: C:\DOS
When you type SUBST E /D
, the drive is
not deleted correctly.
Some programs (such as Microsoft Diagnostics [MSD]) still report the
drive is valid. If you attempt to access the drive from the MS-DOS
command 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 is
reserved for use by DoubleSpace. To determine which drives are
reserved for use by DoubleSpace, type dblspace /list
at the MS-DOS command prompt and then press ENTER.