Microsoft KB Archive/897346

= When you copy data to an autoloader tape drive in Windows Server 2003, performance is slow =

Article ID: 897346

Article Last Modified on 4/13/2005

-

APPLIES TO


 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition

-



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 copy data to an autoloader tape drive in Microsoft Windows Server 2003, performance is slow.



CAUSE
This problem may occur if all the following conditions are true:
 * You are using one of the following autoloader tape drives:
 * Dell 120T DDS4
 * Dell 122T VS80
 * The computer has an Adaptec 39160 SCSI controller.
 * You are using Adaptec driver version 6.4.630.100.



RESOLUTION
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 resolve this problem, add a DWORD value that is named AlwaysDisableMCN to the following registry subkey:

To add this registry value, follow these steps:  Click Start, click Run, type regedit, and then click OK. Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\SCSI\ \ \Device Parameters\MediaChangeNotification

 On the Edit menu, point to New, and then click DWORD Value. Type AlwaysDisableMCN for the name of the DWORD, and then press ENTER. Right-click AlwaysDisableMCN, and then click Modify. In the Value data box, type 00000001, and then click OK.</li> Quit Registry Editor, and then re-start the computer.</li></ol>

<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">

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbtshoot KB897346

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.