Microsoft KB Archive/889330

= A tape device unexpectedly goes offline, and backup operations that use third-party backup software are not completed successfully in Windows 2000 =

Article ID: 889330

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server

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Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
When you use a tape device with a medium-changer device and with a third-party backup program installed on your Microsoft Windows 2000-based computer, Windows 2000 may not be able to control the medium changer. In this scenario, the tape device unexpectedly goes offline, and backup operations are not completed successfully. You must restart your computer to restore connectivity to the medium changer and to the tape device.



CAUSE
This issue occurs if the third-party backup program is not fully compliant with the Plug and Play feature in Windows 2000. When the medium changer or the tape device loses connectivity, the Plug and Play feature in Windows 2000 enumerates a new name for the device. Because the third-party program processes the names of devices when the computer restarts, this program does not recognize the new name of the device. Therefore, the device does not work as expected.



Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
To apply this hotfix, you must have Windows 2000 Service Pack 4 (SP4) installed.

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Date        Time   Version         Size    File name --- 05-Nov-2004 06:30  5.0.2195.6995   16,528  Plasmc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,248  Pnrmc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,184  Elmsmc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,376  Adicvls.sys 05-Nov-2004 06:30  5.0.2195.6995   15,408  Jvcmc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,760  Stkmc.sys 05-Nov-2004 06:30  5.0.2195.6995   16,208  Qlstrmc.sys 05-Nov-2004 06:30  5.0.2195.6995   17,296  Examc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,120  Ddsmc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,632  Nsmmc.sys 05-Nov-2004 06:30  5.0.2195.6995   17,872  Sonymc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,344  Adicsc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,568  Spctramc.sys 05-Nov-2004 06:30  5.0.2195.6995   14,896  Atlmc.sys 05-Nov-2004 06:30  5.0.2195.6995   14,832  Breecemc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,216  Snyaitmc.sys 05-Nov-2004 06:30  5.0.2195.6995   18,320  Hpmc.sys 05-Nov-2004 06:30  5.0.2195.6995   15,856  Discmc.sys 05-Nov-2004 06:30  5.0.2195.6995   14,864  Seaddsmc.sys 05-Nov-2004 06:31  5.0.2195.6995   16,336  Tape.sys 05-Nov-2004 06:30  5.0.2195.6995   14,320  Qntmmc.sys

Add the Persistence registry entry after you install the hotfix
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To enable this hotfix after you install it, add the Persistence registry entry to the registry subkey that is mentioned in step 2, and then set the registry entry to 1. When you do this, symbolic names that are used by the Plug and Play feature are persistent. If you set the Persistence registry entry to 0 (zero), or if you remove the Persistence registry entry, symbolic names are not persistent.

To enable the hotfix, follow these steps:  Click Start, click Run, type regedit in the Open box, and then click OK. Locate and then click the following registry subkey:

 On the Edit menu, point to New, and then click DWORD Value. Type Persistence, and then press ENTER. Right-click the Persistence registry entry, and then click Modify. Type 1 in the Value data box, and then click OK.</li> Quit Registry Editor.</li> Restart the computer.</li></ol>

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WORKAROUND
To work around this issue, restart the computer.

<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

<div class="moreinformation_section">

MORE INFORMATION
Note This fix requires that Tape.sys be in use as the tape class device driver on the system. Some backup programs replace Tape.sys with their own class driver. If a third-party tape class device driver is in use, this update will not have any effect on the system.

For more information about how to resolve this issue in Microsoft Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

873337 A tape device unexpectedly goes offline and backup operations that use third-party backup software are not completed successfully in Windows Server 2003

For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New file naming schema for Microsoft Windows software update packages

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbbug kbfix kbwin2000presp5fix kbhotfixserver kbqfe KB889330

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