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Symptoms

Consider the following scenario:

  • You attach a storage device to a Windows Embedded Compact 7-based device.

  • You format the storage device as Extended FAT (exFAT) file system (FAT12, FAT16, or FAT32).

  • You run an application that starts multiple threads that create and write files on the storage device.


In this scenario, the file system of the storage device may become corrupted.

Cause

This problem occurs because of a buffer management issue in the exFAT file system driver.

Resolution

Software update information

A supported software update is now available from Microsoft as Windows Embedded Compact 7 Monthly Update May 2012. In the "File information" section, the package file name contains the processor type.

Note This Windows Embedded Compact 7 monthly update is available for download from the following Microsoft Download Center website:

Windows Embedded Compact 7 Updates

Prerequisites

This update is supported only if all previously issued updates for this product have also been installed.

Restart requirement

After you apply this update, you must perform a clean build of the whole platform. To do this, use one of the following methods:

  • On the Build menu, click Clean Solution, and then click Build Solution.

  • On the Build menu, click Rebuild Solution.

You do not have to restart the computer after you apply this software update.

Update replacement information

This update does not replace any other updates.

File information

The English version of this software update package 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.

Files that are included in this update package

File name

File size

Date

Time

Path

Exfat.dll

151,552

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Checked

Exfat.map

119,908

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Checked

Exfat.rel

48,458

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Checked

Exfat.dll

249,856

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Debug

Exfat.map

130,171

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Debug

Exfat.rel

53,214

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Debug

Exfat.dll

102,400

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Retail

Exfat.map

53,825

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Retail

Exfat.rel

28,825

05-May-2012

00:16

Public\Common\Oak\Target\Armv5\Retail

Exfat.dll

151,552

05-May-2012

00:18

Public\Common\Oak\Target\Armv6\Checked

Exfat.map

119,908

05-May-2012

00:18

Public\Common\Oak\Target\Armv6\Checked

Exfat.rel

48,458

05-May-2012

00:18

Public\Common\Oak\Target\Armv6\Checked

Exfat.dll

249,856

05-May-2012

00:17

Public\Common\Oak\Target\Armv6\Debug

Exfat.map

130,171

05-May-2012

00:17

Public\Common\Oak\Target\Armv6\Debug

Exfat.rel

53,214

05-May-2012

00:17

Public\Common\Oak\Target\Armv6\Debug

Exfat.dll

102,400

05-May-2012

00:17

Public\Common\Oak\Target\Armv6\Retail

Exfat.map

53,825

05-May-2012

00:17

Public\Common\Oak\Target\Armv6\Retail

Exfat.rel

28,825

05-May-2012

00:17

Public\Common\Oak\Target\Armv6\Retail

Exfat.dll

151,552

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Checked

Exfat.map

119,908

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Checked

Exfat.rel

48,458

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Checked

Exfat.dll

249,856

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Debug

Exfat.map

130,171

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Debug

Exfat.rel

53,214

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Debug

Exfat.dll

102,400

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Retail

Exfat.map

53,825

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Retail

Exfat.rel

28,825

05-May-2012

00:19

Public\Common\Oak\Target\Armv7\Retail

Exfat.dll

196,608

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Checked

Exfat.map

119,407

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Checked

Exfat.rel

158,020

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Checked

Exfat.dll

266,240

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Debug

Exfat.map

129,438

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Debug

Exfat.rel

202,593

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Debug

Exfat.dll

131,072

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Retail

Exfat.map

53,243

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Retail

Exfat.rel

96,540

05-May-2012

00:21

Public\Common\Oak\Target\Mipsii\Retail

Exfat.dll

196,608

05-May-2012

00:23

Public\Common\Oak\Target\Mipsii_fp\Checked

Exfat.map

119,407

05-May-2012

00:23

Public\Common\Oak\Target\Mipsii_fp\Checked

Exfat.rel

158,020

05-May-2012

00:23

Public\Common\Oak\Target\Mipsii_fp\Checked

Exfat.dll

266,240

05-May-2012

00:22

Public\Common\Oak\Target\Mipsii_fp\Debug

Exfat.map

129,438

05-May-2012

00:22

Public\Common\Oak\Target\Mipsii_fp\Debug

Exfat.rel

202,593

05-May-2012

00:22

Public\Common\Oak\Target\Mipsii_fp\Debug

Exfat.dll

131,072

05-May-2012

00:22

Public\Common\Oak\Target\Mipsii_fp\Retail

Exfat.map

53,243

05-May-2012

00:22

Public\Common\Oak\Target\Mipsii_fp\Retail

Exfat.rel

96,540

05-May-2012

00:22

Public\Common\Oak\Target\Mipsii_fp\Retail

Exfat.dll

143,360

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Checked

Exfat.map

120,888

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Checked

Exfat.rel

85,114

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Checked

Exfat.dll

204,800

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Debug

Exfat.map

130,860

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Debug

Exfat.rel

107,647

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Debug

Exfat.dll

98,304

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Retail

Exfat.map

54,350

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Retail

Exfat.rel

61,711

05-May-2012

00:24

Public\Common\Oak\Target\Sh4\Retail

Exfat.dll

122,880

05-May-2012

00:26

Public\Common\Oak\Target\X86\Checked

Exfat.map

120,264

05-May-2012

00:26

Public\Common\Oak\Target\X86\Checked

Exfat.rel

40,918

05-May-2012

00:26

Public\Common\Oak\Target\X86\Checked

Exfat.dll

172,032

05-May-2012

00:25

Public\Common\Oak\Target\X86\Debug

Exfat.map

128,970

05-May-2012

00:25

Public\Common\Oak\Target\X86\Debug

Exfat.rel

45,152

05-May-2012

00:25

Public\Common\Oak\Target\X86\Debug

Exfat.dll

77,824

05-May-2012

00:25

Public\Common\Oak\Target\X86\Retail

Exfat.map

54,950

05-May-2012

00:25

Public\Common\Oak\Target\X86\Retail

Exfat.rel

16,036

05-May-2012

00:25

Public\Common\Oak\Target\X86\Retail

References

For more information about software update terminology, 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

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