Microsoft KB Archive/920918

= An IDE device runs in PIO mode instead of in DMA mode after you update the firmware for the device in Windows XP =

Article ID: 920918

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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For a Microsoft Windows Server 2003 version of this article, see 919168.



SYMPTOMS
After you update the firmware for an IDE device on a computer that is running Microsoft Windows XP, the device runs in Program Input/Output (PIO) mode instead of in Direct Memory Access (DMA) mode. Therefore, the performance of the device may be significantly reduced.



CAUSE
This problem occurs if Windows redetects the device immediately after the firmware update, and the device's firmware information has changed.



RESOLUTION
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:

http://go.microsoft.com/?linkid=6294451

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:

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

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.



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



MORE INFORMATION
For more information about how to find the input/output (DMA/PIO) settings for a device in Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:

310751 Device settings are hard to find in Windows XP

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: kbwinserv2003presp2fix kbwinxpsp3fix kbbug kbhotfixserver kbqfe kbexpertisebeginner KB920918

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