Bootcamp partition disappeared

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Jan 23, 2012
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I am using an iMac with a Windows 7 in a 200Gb bootcamp partition. I have used the systems for about a week, but all of a sudden the windows 7 has disappeared from Finder.

The bootcamp also disappeared in the list of Startup Disk.

In Disk Utility, the partition shows disk03 (greyed) and says the disk is not mounted and identify its format to be MS-DOS (FAT), which cannot be right because Windows 7 is definitely NTFS. I try to Mount it but nothing happens.

In Terminal, it does show up and says about Microsoft Basic Data but without any name.

But even with all these problems, I am able to start Windows 7 from bootup, and I'm able to see OS X from Windows 7.

Any suggestion what the problem may be and how to resolve it?

Disk Utility.png

Console.png
 

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