Ah, I didn't see where you said what OS you were running.
http://support.microsoft.com/default...&Product=winxp
The cause:
Quote:
Convert.exe uses specific work areas to create the new NTFS master file table (MFT) during the conversion process. The error message may occur if the FAT partition that you are trying to convert contains bad sectors in this work area at the end of the partition.
To verify that this is the cause of the error message, run the chkdsk /f /r command on the volume that you want to convert. If the output shows that there are bad sectors, this is likely to be the cause of the error message. The following sample output shows bad sectors in the partition:
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Unfortunately, it seems like the resolution this time around is not so simple:
Quote:
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To resolve this issue, you must back up or move all of the data on the FAT32 volume, reformat the volume with NTFS, and then restore your data.
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