DoubleSpace Cannot Mount Compressed Write-Protected Disk (96200)
The information in this article applies to:
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft Windows 95
This article was previously published under Q96200
When you try to mount a write-protected disk with DoubleSpace, you
receive the following error message:
DoubleSpace cannot mount drive <x> because the file
<x>:\DBLSPACE.nnn is not a valid compressed volume file.
where <x> is the floppy disk drive letter.
When you try to mount a write-protected removable media disk
under MS-DOS 6.2, you receive the following error:
Dblspace cannot mount drive <drive letter>:
The <drive letter>:\Dblspace.000 file is not a valid compressed
volume file. To fix it, type scandisk X:\Dblspace.000 at the
To work around this problem, remove the write protection for the
When DoubleSpace mounts a compressed volume file (CVF), it ensures the
Microsoft DoubleSpace BIOS parameter block (MDBPB) (the overall
configuration sector) and the BitFAT (a table of available heap
sectors) are current. To do this, DoubleSpace must write to the disk.
This feature is under review and will be considered for inclusion in a
You can mount a floppy disk by running DoubleSpace, or you can mount
the floppy disk with the MS-DOS DBLSPACE /MOUNT command. For example,
type the following command at the MS-DOS command prompt and press
ENTER if your floppy disk drive is drive A:
For more information on DoubleSpace, type "help dblspace" (without the
quotation marks) at the MS-DOS command prompt and press ENTER.
This behavior is by design.
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