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Article ID: 310664 - Last Review: January 12, 2015 - Revision: 1.0

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You computer may stop responding (hang) when you attempt to hot detach either a CD-ROM or a DVD drive from the drive bay. Typically, you hot detach the drive by either clicking the Safely Remove Hardware icon in the status area of the taskbar or by using the device bay unlock lever.

Some computers may not support hot detaching the drive and may enter Standby mode automatically when you remove the device. If you resume the computer from Standby mode without removing the drive, the computer may hang until you remove the drive from the drive bay.


This problem occurs if you select UltraDMA (Ultra direct memory access) mode for either a CD-ROM drive or a DVD drive, if the drive is in the drive bay during a hot detach procedure, and if you do not reprogram the drive for the correct transfer mode. This leaves the drive and the controller in an "out of synchronization" condition; the Mode Sense command that is issued to the drive is lost, which causes the computer to hang while waiting for a response.


To resolve this problem, obtain the latest service pack for Windows XP. For additional 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

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. 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: (
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.

File information

The English-language version of this fix should have the following file attributes or later:
   Date         Time   Version      Size     File name  Platform
   02-Nov-2001  19:11  5.1.2600.18  86,784   Atapi.sys  Intel
   02-Nov-2001  19:11  5.1.2600.18  304,128  Atapi.sys  64-bit


To resolve this problem, select PIO mode in your computer basic input/output system (BIOS).


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows XP Service Pack 1.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use ( for other considerations.

Applies to
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
kbnosurvey kbarchive kbautohotfix kbhotfixserver kbqfe kbbug kbfix kbhardware kboswin2000fix kbwinxpsp1fix KB310664
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