When a 32-bit application sends an IOCTL_SFFDISK_DEVICE_COMMAND request on a computer that is running a 64-bit version of Windows Vista, the device driver returns an incorrect value

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SYMPTOMS

Consider the following scenario:

You are running a 32-bit application on a computer that is running a 64-bit version of Windows Vista.
The application sends an IOCTL_SFFDISK_DEVICE_COMMAND request to a Secure Digital (SD) card.

In this scenario, the device driver returns an incorrect value. This problem occurs even though you have applied hotfix 944240 on the computer.

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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:

http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)

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.

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 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 Vista, 64-bit versions

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File name	File version	File size	Date	Time	Platform
Amd64_sdbus.inf_31bf3856ad364e35_6.0.6000.20770_none_cc5906f89ee45580.manifest	Not Applicable	1,666	12-Feb-2008	17:00	Not Applicable
Amd64_sffdisk.inf_31bf3856ad364e35_6.0.6000.20770_none_feb1d337be77376f.manifest	Not Applicable	2,838	12-Feb-2008	17:00	Not Applicable
Amd64_sffdisk.inf_31bf3856ad364e35_6.0.6001.22112_none_00daf1f9bb6b5368.manifest	Not Applicable	2,838	12-Feb-2008	17:00	Not Applicable
Package_1_for_kb948870~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	1,990	12-Feb-2008	16:55	Not Applicable
Package_2_for_kb948870~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	1,826	12-Feb-2008	16:55	Not Applicable
Package_3_for_kb948870~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	2,336	12-Feb-2008	16:55	Not Applicable
Package_for_kb948870_client_0~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	1,433	12-Feb-2008	16:55	Not Applicable
Package_for_kb948870_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	1,375	12-Feb-2008	16:55	Not Applicable
Package_for_kb948870_client~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	1,721	12-Feb-2008	16:55	Not Applicable
Package_for_kb948870_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	1,433	12-Feb-2008	16:55	Not Applicable
Package_for_kb948870_server~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not Applicable	1,438	12-Feb-2008	16:55	Not Applicable
Update.mum	Not Applicable	2,098	12-Feb-2008	16:55	Not Applicable
Sdbus.sys	6.0.6000.20770	104,448	12-Feb-2008	03:09	x64
Sffdisk.sys	6.0.6000.20770	14,848	12-Feb-2008	03:31	x64
Sffp_mmc.sys	6.0.6000.20770	14,848	12-Feb-2008	03:31	x64
Sffp_sd.sys	6.0.6000.20770	15,360	12-Feb-2008	03:31	x64
Sffdisk.sys	6.0.6001.22112	14,848	12-Feb-2008	04:02	x64
Sffp_mmc.sys	6.0.6001.22112	14,336	12-Feb-2008	04:02	x64
Sffp_sd.sys	6.0.6001.22112	13,824	12-Feb-2008	04:02	x64

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STATUS

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

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MORE INFORMATION

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

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

For a 32-bit application to send an IOCTL_SFFDISK_DEVICE_COMMAND request in a 64-bit version of Windows Vista, you must have hotfix 944240 applied on the computer. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

944240 (http://support.microsoft.com/kb/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: "ERROR_ACCESS_DENIED"

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