FIX: You cannot create a startup El Torito-compatible CD by using Windows XP Image Mastering API (IMAPI) on a Windows XP-based computer

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The Microsoft Windows XP Image Mastering API (IMAPI) contains a defect that prevents you from successfully creating a startup CD-ROM with a single startup image. This problem resembles the problem in the hard disk drive image section of the El Torito startup CD-ROM specification. The defect is present in Windows XP Home and Windows XP Professional operating system products. This includes all service pack releases of these products.

Additionally, you may find that the IMAPI fails when you try to use the existing Windows XP IMAPI to create a startup El Torito-compatible CD. This occurs if the number of bytes in the original startup image file is larger than one fourth of the total number of bytes available on the blank CD media that you are using. The failure is the result of a coding error in the Windows XP IMAPI. This coding error causes the IMAPI to incorrectly write four times as many bytes into the final CD-ROM startup image file as are actually in the original startup image file.
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.


No prerequisites are required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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 XP with Service Pack 1
File nameFile versionFile sizeDateTimePlatform
Windows XP with Service Pack 2
File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.
Content Maintenance 50188 IMAPI ISO

Article ID: 912666 - Last Review: 01/16/2015 15:35:38 - Revision: 3.0

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