You cannot write to a BD-RE disc or to a DVD-RAM disc on a Windows Vista SP1-based computer even after you disable the write-protection feature

Consider the following scenario:

• You have a write-protected Blu-ray Disc Rewritable (BD-RE) disc or a write-protected DVD-RAM disc.
• You disable the write-protection feature on the disc.
• You insert the disc into a compatible drive on a Windows Vista Service Pack 1 (SP1)-based computer.

In this scenario, the disc is recognized as writable media. However, when you try to write to the disc, the operation fails, and you are prompted to insert writable media.

This problem occurs with all Universal Disk Format (UDF) file systems, such as UDF 1.5, UDF 2.0, and UDF 2.01.

Note The write-protection feature is typically controlled by the notch on the DVD-RAM cartridge or by third-party write-protection tools.

Update information

The following files are available for download from the Microsoft Download Center:

Update for Windows Server 2008 (KB950194)
Download the update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=55A6A04D-94D9-43D4-AD9B-15994A69E2DF)

Update for Windows Server 2008 for Itanium-based Systems (KB950194)
Download the update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=7CAD9DCB-08CE-44D9-862D-F76F1D99C6D8)

Update for Windows Server 2008 x64 Edition (KB950194)
Download the update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=D744C42E-6360-46ED-89A5-C57B899F4369)

Update for Windows Vista (KB950194)
Download the update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=91A85E07-D4B6-4E73-8CC2-A665AE243D78)

Update for Windows Vista for x64-based Systems (KB950194)
Download the update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=8215FA53-869A-4E38-922E-020210847A3D)

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Note You may want to determine whether a 32-bit version of Windows Vista or a 64-bit version of Windows Vista is installed. To do this, click the following article number to view the article in the Microsoft Knowledge Base:

Prerequisites

To apply this update, you must have Windows Vista SP1 installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You must restart the computer after you apply this udpate.

Update replacement information

This update does not replace any other udpates.

File information

The English version of this update 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 Service Pack 1, x86-based versions

Windows Vista Service Pack 1, x64-based versions

Windows Vista Service Pack 1, Itanium-based versions

To work around this problem, use one of the following methods:

• Restart the computer.
• Disconnect the BD-RE drive or the DVD-RAM drive from the computer, and then reconnect it.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

For help with CD or DVD drive problems in Windows Vista, visit the following Microsoft web page: