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If you have hotfix 885222 applied on a Windows XP SP2-based computer, and then you upgrade to Windows XP SP3, an installed 1394b FireWire device reverts from S400 speed to S100

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On a Windows XP Service Pack 2 (SP2)-based computer, the 1394b FireWire device usually runs at S100 speed. After you apply hotfix 885222 and update the registries according to the instructions in Microsoft Knowledge Base article 885222, the device runs at S400 speed.

However, after you upgrade the computer to Windows XP Service Pack 3 (SP3), the device no longer runs at S400 speed. Instead it reverts to S100 speed. Therefore, the performance of the 1394b FireWire device is greatly decreased.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must have Windows XP Service Pack 3 installed.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP service pack

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 item in Control Panel.
Windows XP with Service Pack 3, x86-based versions
File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
885222 Performance of 1394 devices may decrease after you install Windows XP Service Pack 2

Id. de artículo: 955408 - Última revisión: 10/08/2011 05:48:00 - Revisión: 2.0

Microsoft Windows XP Service Pack 3

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