System Locks Up When Accessing Floppy Drive (141831)
The information in this article applies to:
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 4.0
This article was previously published under Q141831 SYMPTOMS
When you attempt a drag-and-drop operation on files, either to or from a
floppy disk, the system may stop responding.
CAUSE
Some high performance video cards enable Uncached Speculative Write
Combining (USWC) memory. In combination with some motherboard BIOSes, this
may cause a memory conflict in the Graphical User Interface (GUI), which
may cause the system to stop responding.
RESOLUTION
To resolve this problem, you can either boot using the VGA mode or add the
following registry key:
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.
- Start Registry Editor (Regedt32.exe) and locate the following Registry
subkey in the HKEY_LOCAL_MACHINE subtree:
KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrive - On the Edit menu, click Add Key.
- Enter the following:
Key Name: DisableUSWC
Class: <leave blank> - Click OK and quit the Registry Editor.
- Shut down and restart Windows NT.
The presence of the DisableUSWC key will cause the miniport to not use
USWC. With USWC disabled, the memory conflict will not occur and the system
will not stop responding for this reason. STATUS
Microsoft has confirmed this to be a problem in Windows NT Workstation and
Server version 4.0. We are researching this problem and will post new
information here in the Microsoft Knowledge Base as it becomes available.
| Modification Type: | Major | Last Reviewed: | 2/19/2002 |
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| Keywords: | kbenv kbHardware KB141831 |
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