Microsoft KB Archive/944240

= An application that sends an IOCTL_SFFDISK_DEVICE_COMMAND request to a Secure Digital (SD) card receives an error message on a 64-bit version of Windows Vista: &quot;ERROR_ACCESS_DENIED&quot; =

Article ID: 944240

Article Last Modified on 12/4/2007

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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 develop an application that sends an IOCTL_SFFDISK_DEVICE_COMMAND request to a Secure Digital (SD) card.
 * You compile the application on a 32-bit version of Windows Vista.

In this scenario, the application obtains a &quot;Success&quot; value from the SD card. However, when a 64-bit version of Windows Vista uses the Microsoft Windows-32-on-Windows-64 (WOW64) subsystem to run the 32-bit application, the application obtains the following error message from the SD card:

ERROR_ACCESS_DENIED



CAUSE
This issue occurs because a 64-bit version of Windows Vista does not support an IOCTL_SFFDISK_DEVICE_COMMAND request for the SD card on the WOW64 subsystem for a 32-bit application that is compiled on a 32-bit version of Windows Vista. The SFFDISK_DEVICE_COMMAND_DATA structure has a ULONG_PTR member that supports an 8-bytes length on the WOW64 subsystem. However, the SFFDISK_DEVICE_COMMAND_DATA structure has a ULONG_PTR member that supports a 4-bytes length on a 32-bit version of Windows Vista. This causes the issue that is mentioned in the &quot;Symptoms&quot; section.



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 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 more information about the IOCTL_SFFDISK_DEVICE_COMMAND request, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/ms789769.aspx

For more information about the SFFDISK_DEVICE_COMMAND_DATA structure, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/ms789790.aspx

Keywords: kbqfe kbexpertiseinter kbhotfixserver KB944240

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