A Secure Digital (SD) card may not be recognized on a Windows 7 based computer.

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Article ID: 981642 - View products that this article applies to.
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Source: Microsoft Support

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Symptoms



When you insert a Secure Digital (SD) card into a Windows 7 based computer, Windows 7 may not recognize it properly. This problem occurs with a particular SD card. When this problem occurs, you may experience either of the followings:

 

- Windows 7 does not recognize the SD card and it does not appear on Device Manager.

 

- Windows 7 recognizes the SD card several minutes after it is inserted and then it appears on Device Manager. However, trying to browse the SD card in Windows Explorer generates the following message, prompting you to format the SD card:

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You need to format the disk in drive (drive letter): before you can use it.

Do you want to format it?

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 You are able to format the SD card after the message appears. However, in several minutes, you will receive the "Windows was unable to complete the format" error message and fail to format it.

 

If you insert the same SD card into a Windows Vista Service Pack 2 based computer, Windows Vista can recognize it properly and it can be used properly. Given this, this problem would cause a greater inconvenience to the customers who upgrade their computer from Windows Vista to Windows 7 or who use their SD card both on Windows 7 and Windows Vista based computers.

 

Cause



To strictly comply with the SD card specification, Windows 7 modified Secure Digital Bus Driver (Sdbus.sys). This problem occurs when you use certain SD cards that do not behave according to the SD card specification.

 

Resolution



This behavior is by design.

 

More Information

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Properties

Article ID: 981642 - Last Review: March 12, 2010 - Revision: 1.0
APPLIES TO
  • Windows 7 Starter
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Enterprise
  • Windows 7 Ultimate
Keywords: 
kbrapidpub KB981642

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