Article ID: 818733 - View products that this article applies to.
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When you insert a DVD-RW disc into the DVD drive of a Microsoft Windows XP-based computer, Windows XP does not recognize the disc. For example, you do not see any files on the disc.

You may also experience this problem with DVD-RW discs that have been formatted as DVD-VR. Some consumer DVD recorders use the DVD-VR format.


This issue occurs because the Universal Disc Format driver, Udfs.sys, tries to read the DVD-RW disc by using a packet length of 32 blocks instead of by using a packet length of 16 blocks. CD-RW uses a packet length of 32 blocks, but DVD-RW uses a packet length of 16 blocks.


Service pack information

To resolve this problem, obtain the latest service pack for Windows XP. For more 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. The English version of this fix has the file attributes (or later) 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 tool in Control Panel. After the fix is installed, this file will have the following file attributes or later:
   Date         Time     Version         Size    File name    SP Level
   13-May-2003  01:42am  5.1.2600.114    64,000  Udfs.sys     Non SP
   13-May-2003  12:36am  5.1.2600.1222   64,000  Udfs.sys     SP1


If you continue to experience problems when your Windows XP-based system tries to read a DVD-RW disc, contact the manufacturer of your DVD recorder for any firmware updates that may be available.


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 2.


Article ID: 818733 - Last Review: August 29, 2007 - Revision: 3.2
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition SP1
  • Microsoft Windows XP Professional SP1
kbautohotfix kbhotfixserver kbqfe kbwinxppresp2fix kbwinxpsp2fix kbqfe kbfix kbbug KB818733

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