Open Software Solutions

Consider the following scenario. You connect an Institute of Electrical and Electronics Engineers (IEEE) 1394 hard disk to a Windows Vista-based computer that uses a VIA Technologies 1394 host controller. However, performance is slower than you expect when you read from the hard disk or write to the hard disk.

For example, you may experience decreased reading and writing performance of approximately 20 percent in Windows Vista when you compare it to Microsoft Windows XP with Service Pack 2 in the same test environment.

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This issue occurs because high-speed 1394 physical-layer unit (PHY) mode is not enabled for the VIA 1394 host controller in Windows Vista.

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Hotfix information

This hotfix is specific to the VIA 1394 host controller. This hotfix enables high-speed 1394 PHY mode for the VIA 1394 host controller.

A supported hotfix is now 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

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 Vista, x86-based versions

File name	File version	File size	Date	Time	Platform
Update.mum	Not applicable	2,021	03-Apr-2007	23:44	Not applicable
X86_1394.inf_31bf3856ad364e35_6.0.6000.20571_none_f98801ce2216e38b.manifest	Not applicable	2,363	03-Apr-2007	23:45	Not applicable
1394bus.sys	6.0.6000.20571	53,376	03-Apr-2007	12:02	Not applicable
Ohci1394.sys	6.0.6000.20571	61,952	03-Apr-2007	12:02	Not applicable

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_1394.inf_31bf3856ad364e35_6.0.6000.20571_none_55a69d51da7454c1.manifest	Not applicable	2,365	03-Apr-2007	23:47	Not applicable
Update.mum	Not applicable	2,033	03-Apr-2007	23:44	Not applicable
1394bus.sys	6.0.6000.20571	65,024	03-Apr-2007	12:32	x64
Ohci1394.sys	6.0.6000.20571	72,064	03-Apr-2007	12:32	x64

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

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For more information about terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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

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