DOCUMENT:Q158362  20-FEB-2002  [winnt]
TITLE   :Drive Letters Assigned In Disk Admin Disappear On Restart
PRODUCT :Microsoft Windows NT
PROD/VER::3.5,3.51,4.0
OPER/SYS:
KEYWORDS:kbenv kbsetup

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

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

SYMPTOMS
========

A drive letter is assigned to a SCSI device in Disk Administrator. The drive is
accessible in File Manager, but after you restart your computer, the drive
letter is no longer visible in File Manager.

In Disk Administrator, the SCSI drive is shown as formatted with either FAT or
NTFS but the drive letter that was assigned earlier is now gone. The drive
letter no longer appears for this drive in File Manager.


CAUSE
=====

This problem is caused by one of the following:

 - An IDE device attached to the computer is the boot device AND where the SCSI
   device does not contain the operating system files AND where the SCSI device
   is configured for BOOT in the Control Panel Devices tool.

   -or-

 - On Compaq systems that require a Compaq SSD, drive letters assigned by Disk
   Administrator may not be retained after rebooting the machine if the latest
   Compaq SSD has not been applied.

RESOLUTION
==========

WARNING: If your system boots from SCSI devices this problem should NOT be
occurring and you should NOT execute the following series of steps. Performing
these steps may cause the system to become non-bootable.

1. Click the Start button, point to Settings, and click Control Panel.

2. Double-click the Devices icon, and change the SCSI device driver from a
   Startup setting of BOOT to a Startup setting of SYSTEM. For example, if using
   an Adaptec 2940 series SCSI controller, set the AIC78xx device by clicking
   the Startup button, selecting SYSTEM, rather than BOOT, and then clicking OK.

3. If running Windows NT V3.5x, then change the SCSIDISK device driver from
   Startup setting of BOOT to a Startup setting of SYSTEM.

4. Close Control Panel.

5. Open Disk Administrator, select the SCSI drive, and then assign a drive
   letter. Close Disk Administrator.

6. Restart the computer. Verify that the drive letter still exists in File
   Manager.

-or-

Download and install the latest appropriate SSD from Compaq. Information on and
locations of SSDs may be found on Compaq's ftp site:

   ftp://ftp.compaq.com/pub/softpaq/allfiles.txt

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

The products mentioned here are manufactured by vendors independent of
Microsoft; we make no warranty, implied or otherwise, regarding these products'
performance or reliability.


Additional query words: system device

======================================================================
Keywords          : kbenv kbsetup 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT351search kbWinNT350search kbWinNT400search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search
Version           : :3.5,3.51,4.0
Issue type        : kbprb

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

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 2002.