DOCUMENT:Q111908 21-NOV-1999 [msdos] TITLE :DoubleSpace Err Msg: DBLSPACE. Is Not a Valid CVF PRODUCT :Microsoft Disk Operating System PROD/VER:MS-DOS:6.2 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft MS-DOS operating system version 6.2 ------------------------------------------------------------------------------- SYMPTOMS ======== ScanDisk repairs an error in the Microsoft DoubleSpace BIOS Parameter Block (MDBPB), or does not find any errors, when examining a compressed volume file (CVF); however, DoubleSpace is unable to mount the CVF and displays the following error DoubleSpace cannot mount drive . The :\DBLSPACE. file is not a valid compressed volume file. To fix it, type SCANDISK :\DBLSPACE. at the command prompt. where is the drive letter of the CVF when mounted, is the host drive, and is the CVF's sequence number (extension). You do not have access to the files on the compressed drive. STATUS ====== There may be rare instances of CVF corruption that ScanDisk cannot correct. Microsoft is researching this problem and will post new information in the Microsoft Knowledge Base as it becomes available. CAUSE ===== WORKAROUND ========== If you are using MS-DOS 6.2, and your CVF was not created with a beta version of MS-DOS 6.0, contact Microsoft Product Support Services for assistance in resolving this problem. NOTE: If your CVF was created with a beta version of MS-DOS 6.0, you need to remove the DoubleSpace CVFs, and then install an MS-DOS 6.x Upgrade. You will not be able to backup the data on the damaged CVF in this case. IMPORTANT: If you have the above symptoms and are running MS-DOS 6.0, upgrade to MS-DOS 6.2 and use ScanDisk to repair the CVF. ScanDisk can correct most instances of CVF corruption that prevent DoubleSpace from mounting the volume. MORE INFORMATION ================ To access the files on a compressed drive or CVF, DoubleSpace must mount the CVF. While ScanDisk can correct most problems that prevent DoubleSpace from mounting a CVF, there may be rare cases of CVF corruption that ScanDisk cannot repair. REFERENCES ========== "Microsoft MS-DOS 6 Programmer's Reference" Additional query words: 6.22 6.20 tshoot invalid damaged ====================================================================== Keywords : Technology : kbMSDOSSearch kbMSDOS620 Version : MS-DOS:6.2 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.