Microsoft KB Archive/944292

= Windows Vista does not recognize an external USB optical disc drive when you reconnect the USB optical disc drive to the computer =

Article ID: 944292

Article Last Modified on 11/14/2007

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APPLIES TO


 * Windows Vista Business
 * Windows Vista Enterprise
 * Windows Vista Home Basic
 * Windows Vista Home Premium
 * Windows Vista Starter
 * Windows Vista Ultimate
 * Windows Vista Business 64-bit Edition
 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Home Basic 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition

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SYMPTOMS
Consider the following scenario:
 * You have a Windows Vista-based computer that does not have an internal USB optical disc drive. Instead, an external USB optical disc drive is connected to the computer.
 * You run an application that calls the AcquireExclusiveAccess routine in the Imapi2.dll file to exclusively use the optical disc drive on the computer.

In this scenario, you may notice that the external USB optical disc drive is removed from the Windows Vista operating system. When you reconnect the optical disc drive to the Windows Vista-based computer, the operating system does not recognize the optical disc drive. Additionally, a yellow exclamation mark (!) may appear next to the external USB optical disc drive in Device Manager. You may receive an error that resembles the following:

Error 38 (CM_PROB_DRIVER_FAILED_PRIOR_UNLOAD)

Note The external USB optical disc drive can be displayed correctly in Device Manager after you restart the computer.



Hotfix information
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

Prerequisites
There are no prerequisites for installing this hotfix.

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace a previously released hotfix.

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, 64-bit versions


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 information about the FSCTL_DISMOUNT_VOLUME control code, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/aa364562.aspx

For information about the FSCTL_IS_VOLUME_MOUNTED control code, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/aa364574.aspx

This hotfix cannot resolve the problem for all optical disc drives. If this hotfix does not resolve the problem for the optical disc drive that you use, contact the manufacturer of your hardware for more information about how to resolve the problem. For information about how to contact the manufacturer of your hardware, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

65416 Hardware and software vendor contact information, A-K

60781 Hardware and software vendor contact information, L-P

60782 Hardware and software vendor contact information, Q-Z

For more information about media issues on a Windows Vista-based computer, click the following article number to view the article in the Microsoft Knowledge Base:

930917 An optical disc appears to be blank after you format the disc by using the Live File System component on a Windows Vista-based computer

Keywords: kbqfe kbexpertisebeginner kbhotfixserver KB944292

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