Q120739: Raising Max SFM Volume Size Reported to System 7.5 Mac Users

Article: Q120739
Product(s): Microsoft Windows NT
Version(s): 3.50
Operating System(s): 
Keyword(s): 
Last Modified: 08-AUG-2001

3.50

WINDOWS

kbnetwork kbenv

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

- Microsoft Windows NT Server versions 3.5, 3.51, 4.0 
-------------------------------------------------------------------------------

SUMMARY
=======

A registry flag controls the maximum volume size and free space reported by the
Services for Macintosh (SFM) file server. Since System 7.5 now allows
Macintoshes to support volumes up to 4GB-1 (0xFFFFFFFF), administrators may want
to use this flag to help Macintosh clients if all clients are running System 7.5
and the SFM volume resides on a disk partition greater than 2018MB.

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

Pre-System 7.5 Macintoshes support volume sizes up to 2GB-1 (although tests have
shown the actual limit to be around 2018MB). Because of this, SFM restricts the
values it reports for total and free space on SFM volumes to 2018MB, when the
actual size of the SFM volume's disk partition is larger.

System 7.5 can handle volumes up to 4GB-1, and you may find it useful to raise
the maximum values reported for SFM volumes to this new limit.

WARNING: ALL Macs connected to the volume must be System 7.5; reporting a volume
size greater than 2GB-1 to a pre-System 7.5 Macintosh crashes Macintosh Finder.

You can raise the maximum reported size for SFM volumes to 4GB-256 (0xFFFFFF00)
by creating the SFM volume, then editing the registry entry:

  HKEY_LOCAL_MACHINES\System\CurrentControlSet\Services
  \MacFile\Parameters\Volumes\<VolumeName>

  Properties=xxxxx

  by adding 262144 (0x00040000) to the number xxxxx.

  WARNING: Using Registry Editor incorrectly can cause serious, system-wide
  problems that may require you to reinstall Windows NT to correct them.
  Microsoft cannot guarantee that any problems resulting from the use of
  Registry Editor can be solved. Use this tool at your own risk.

Stop and restart Macfile to make this change take effect on the SFM volume.

In Windows NT 3.51 you can change this value globally for all volumes. To do
this, add bit 0x10 to the following section of the registry and every volume
will be 4GB enabled:

  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MacFile\Parameters
  ServerOptions: REG_DWORD: 0x13

NOTE: The ServerOptions value has a default value of 0x03, after adding 0x10 to
0x03 the result becomes 0x13. After making this change every volume will be 4GB
enabled.

Additional query words: prodnt
======================================================================
Keywords          :  
Technology        : kbWinNTsearch kbWinNT351search kbWinNT350search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search
Version           : 3.50

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

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.