Microsoft KB Archive/96200

= DoubleSpace Cannot Mount Compressed Write-Protected Disk =

Article ID: 96200

Article Last Modified on 11/17/2003

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APPLIES TO


 * Microsoft MS-DOS 6.0 Standard Edition
 * Microsoft MS-DOS 6.2 Standard Edition
 * Microsoft Windows 95

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This article was previously published under Q96200



SYMPTOMS
When you try to mount a write-protected disk with DoubleSpace, you receive the following error message:

DoubleSpace cannot mount drive  because the file

:\DBLSPACE.nnn is not a valid compressed volume file.

where  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 :

The :\Dblspace.000 file is not a valid compressed

volume file. To fix it, type scandisk X:\Dblspace.000 at the

command prompt.



WORKAROUND
To work around this problem, remove the write protection for the disk.



MORE INFORMATION
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 future release.

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:

dblspace /mount a:

For more information on DoubleSpace, type &quot;help dblspace&quot; (without the quotation marks) at the MS-DOS command prompt and press ENTER.



STATUS
This behavior is by design.

Additional query words: 6.00 6.20 win95 win95x read-only read only drivespace drvspace

Keywords: kbenv KB96200

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