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# STOP 7B When Not Updating File Systems for Windows NT 3.1

Article ID: 122441

Article Last Modified on 11/1/2006

APPLIES TO

- Microsoft Windows NT Advanced Server 3.1
- Microsoft Windows NT Workstation 3.1
- Microsoft Windows NT Advanced Server 3.1
- Microsoft Windows NT Workstation 3.5
- Microsoft Windows NT Server 3.5

This article was previously published under Q122441
3.10 3.50
WINDOWS
kbusage

## SYMPTOMS

After you install Windows NT version 3.5 to another directory instead of upgrading Windows NT version 3.1 and both versions of Windows NT reside on an NTFS or FAT partition, the following STOP message may appear when you start Windows NT version 3.1:
STOP: 0x0000007B Inaccessible Boot Device
During bootup when checking the file system(s), the error message for NTFS is:
This drive cannot be checked with this version of UNTFS.DLL.
File Manager gives a description of the drive as:
Wrong disk is in the drive.
Disk Administrator says the format of the drive is:
Unknown.

## CAUSE

This problem occurs due to changes made to the file systems in Windows NT version 3.5.

## RESOLUTION

To correct this problem:

1. Start Windows NT version 3.5.
2. Rename the following files in the <winnt31root>\SYSTEM32 directory to another file name on the hard disk drive:

   UFAT.DLL
   UNTFS.DLL

   Rename the following files in the <winnt31root>\SYSTEM32\DRIVERS subdirectory to another file name on the hard disk drive:

   NTFS.SYS
   FASTFAT.SYS

3. Copy the same files listed above (Step 2) from the Windows NT version 3.5 CD (for either Server or Workstation) to the same subdirectory of <winnt31root>\SYSTEM32\DRIVERS.
   NOTE: These replacement files are in expanded format and are located in the FS31UPD\I386 subdirectory (for Intel-based computers) on the Windows NT version 3.5 CD.
4. Shut down and restart the computer with Windows NT version 3.1.
5. Run UPDATE.EXE located in the FS31UPD\I386 subdirectory (for Intel- based computers) on the Windows NT version 3.5 CD (for either Server or Workstation).

Additional query words: prodnt 3.10 hard disk trap 0x7B

Keywords: KB122441