Q119780: Using ForceMapper with Windows for Workgroups 3.11

Article: Q119780
Product(s): Microsoft Windows 3.x Retail Product
Version(s): WINDOWS:3.11
Operating System(s): 
Keyword(s): 
Last Modified: 27-OCT-1999

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows for Workgroups version 3.11 
-------------------------------------------------------------------------------

SUMMARY
=======

It may be necessary to force the mounting of VFAT on hard disk drives that are
not detected as 32-bit disk access volumes and volumes that are compressed.
Under normal circumstances, the only type of drive volumes that are not detected
as 32-bit disk access volumes are SCSI and ESDI drives. In the case of
compression (DoubleSpace version 6.2, DriveSpace, or Stacker version 3.1), extra
processing of the INT 21h calls is required before the INT 13h call can occur.
(DoubleSpace version 6.0 does not allow the mounting of VFAT.)

RMM.D32 is the real-mode-mapper component that allows VFAT to mount on non-
32-bit disk access volumes and compressed volumes. If 32-bit file access is
enabled on one of these volumes, the following changes are made to the
SYSTEM.INI file by Windows for Workgroups 3.11:

     [386Enh]
     device=ios.386
     device=vxdldr.386

IOS.386 replaces the *BLOCKDEV component of a 32-bit disk access volume, and
VXDLDR.386 loads the RMM.D32 real-mode mapper. RMM.D32 does not appear in the
SYSTEM.INI file because it is a component of another Windows for Workgroups file
and is loaded during Windows startup by VXDLDR.386.

MORE INFORMATION
================

When a compressed drive or a non-32-bit disk access volume exists but is not
properly detected, you may need to force the loading of the real-mode mapper,
RMM.D32. To do this, add the following line to the [386Enh] section of the
SYSTEM.INI file:

  ForceMapper=C

  -or-

  ForceMapper=CD

Use the second example to force multiple drives to use the RMM.D32 mapper. Put
drive letters that represent each drive on your system, and do not separate the
letters with commas.

Additional query words: 3.11 vfat fastdisk

======================================================================
Keywords          :  
Technology        : kbAudDeveloper kbWFWSearch kbWFW311
Version           : WINDOWS:3.11

=============================================================================

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 1986-2002.