Microsoft KB Archive/942869

= The read speed of the DVD-R/RW drive is much slower than the expected speed on a Windows Vista-based computer =

Article ID: 942869

Article Last Modified on 10/18/2007

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APPLIES TO


 * 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
 * Windows Vista Business
 * Windows Vista Enterprise
 * Windows Vista Home Basic
 * Windows Vista Home Premium
 * Windows Vista Starter
 * Windows Vista Ultimate

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SYMPTOMS
On a Windows Vista-based computer, you finish recording an optical disc, such as a CD-R, a CD-RW, a DVD-R, or a DVD-RW disc. To record the optical disc, you use the DVD-R/RW drive, and you select the mastered disc format. Then, you notice that the read speed of the drive is much slower than the expected speed. This slow read speed causes the Windows Vista operating system to take more time to copy files from the drive.

Note If you use a built-in DVD drive, you must restart the operating system, or you must resume from hibernation, to reset to the default speed of the DVD drive. If you use an external DVD drive, you only have to restart the external DVD drive.



CAUSE
When the system is writing the disc, the drive uses a slow speed. However, some drives do not automatically set the drive speed back to the default speed after the system finishes writing the disc, and the system ejects the disc. Therefore, poor performance occurs when the system reads the disc again.



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
No prerequisites are required.

Restart Requirement
You have to 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


MORE INFORMATION
For more information about the CD format or the DVD format that is used on a Windows Vista-based computer, visit the following Microsoft Web site:

http://windowshelp.microsoft.com/Windows/en-US/Help/2af64e60-60aa-4d79-ab6c-3a5db5806cbe1033.mspx

For more information about how to burn a CD or a DVD on a Windows Vista-based computer, visit the following Microsoft Web site:

http://windowshelp.microsoft.com/Windows/en-US/Help/b47eb51a-ea6d-4d97-97b0-2d07a59316981033.mspx



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

Keywords: kbfix kbqfe kbexpertisebeginner KB942869

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