Restoring NTBackup Sets Generated by Faulty SP4 Tandqic.sys

ID: Q240087

The information in this article applies to:
  • Microsoft Windows NT Server version 4.0 SP4
  • Microsoft Windows NT Workstation version 4.0 SP4
  • Microsoft Windows NT Server, Enterprise Edition version 4.0 SP4
IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SYMPTOMS

When you use the the NTBackup program in conjunction with the Tandqic.sys driver provided in Windows NT 4 Service Pack 4 (SP4) to restore data from a tape backup on a Tandberg SLR5 tape drive, you may not be able to restore the data. You may not be able to retrieve the backup catalog or restore single files. Even though you can successfully backup data to a tape in the SLR5 drive, you may find that you receive confirmation of a successful restore operation when in fact, no data is restored.


CAUSE

This behavior occurs because certain registry values for the NTBackup program need to be set to 0 instead of the default ("1") and some registry flags need to be modified for the backup files (created with the SP4 Tandqic.sys driver) to be restored.


RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0. For additional information, please see the following article in the Microsoft Knowledge Base:

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack
WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

To resolve this issue, you can use the Regset.exe utility, located in the Windows NT 4.0 Service Pack 6 \Support\Utils\i386 folder, to automatically adjust the pertinent registry entries so that data can be restored from a tape backup that was created with a computer running Windows NT 4.0 Service Pack 4.

You can also manually modify the registry settings that control the NTBackup program when using the Tandqic.sys driver. To do this:
  1. Start Registry Editor (Regedt32.exe).


  2. Locate the "Use fast file restore" value under the following key in the registry:
    HKEY_LOCAL_CURRENT_USER\Software\Microsoft\Ntbackup\Backup Engine


  3. On the Edit menu, click String, type 0, and then click OK.


  4. Locate the "Use Tape Catalogs" value under the following key in the registry:
    HKEY_LOCAL_CURRENT_USER\Software\Microsoft\Ntbackup\User Interface


  5. On the Edit menu, click String, type 0, and then click OK.


  6. Quit Registry Editor.



STATUS

Microsoft has confirmed this to be a problem in Windows NT 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 6.


MORE INFORMATION

For additional information about Tandberg tape drives and their compatibility with the Ntbackup.exe program, contact Tandberg Technical Support at (800) 258-8285 or visit their Web site at:

http://www.tandberg.com

Additional query words:

Keywords : kbenv kbhw kbtool ntsp kbbug4.00 kbfix4.00 NT4SP6Fix
Version : winnt:4.0 SP4
Platform : winnt
Issue type : kbbug


Last Reviewed: February 2, 2000
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