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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 - View products that this article applies to.
For a Microsoft Windows Server 2003 version of this article, see 919168
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.
This problem occurs if Windows redetects the device immediately after the firmware update, and the device's firmware information has changed.
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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
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, contact 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:
http://support.microsoft.com/contactus/?ws=supportNote 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.
File informationThe 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.
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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:
310751For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/310751/ )Device settings are hard to find in Windows XP
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates