This information applies to both Microsoft DoubleSpace and Microsoft
DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands
If you put a removable media disk in a drive and issue a command that
doesn't automatically mount it, DoubleSpace does not automatically
mount it until you trigger a disk change. For example, the following
DoubleSpace commands do not cause a DoubleSpace-compressed disk in a
removable media drive to be mounted automatically.
DBLSPACE /DEFRAG <drive>:
DBLSPACE /info <drive>:
DBLSPACE /uncompress <drive>:
To work around this problem, access the DoubleSpace-compressed drive
before you try to access it using DoubleSpace. For example, if your
removable DoubleSpace-compressed disk is in drive A, type "A:"
(without the quotation marks) at the MS-DOS command prompt and then
If you have already typed a command that doesn't cause the disk to be
automatically mounted, do the following:
• Eject the disk from the drive.
• Reinsert the disk into the drive.
• Access the drive. For example, type A: at the MS-DOS command prompt and then press ENTER.
How ChangeLine Support Effects this Situation
If you use the DRIVPARM command (in the CONFIG.SYS file) to disable
ChangeLine support, you can successfully mount the removable media
disk by accessing it.
With ChangeLine support enabled (the MS-DOS default), after you insert
a floppy disk in drive A and type "dblspace /info a:" (without the
quotation marks), you have to eject the disk, reinsert it, and then
access it (that is, type "A:" [without the quotation marks]) to gain
access to the compressed data. If you have ChangeLine support
disabled, you can force the floppy disk to be automatically mounted by
and then pressing ENTER--
even after you access it in a way that causes it not to be mounted.