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I use PhotoRescue when I need to recover from a CF card.
The problem most likely started by pulling the card from the camera too soon after the last shot.
CF cards use the normal FAT32 file system found in Windows 98SE. The last thing written to disk every time is the File Allocation Table (FAT).... basically it is an index of where on the disk each file starts and stops.
If you pull the card just a millesecond before the system is done writting the FAT, you lose that index.
The image or file data can be there (on the floppy, HD or CF card), but without the FAT (index) the computer doesn't know where to find it.
Photo Rescue and other such software often find the previous FAT on the card and uses it to creat a new one, or it simply finds a file, follows all bits of it and then the next, until it recovers all it can.
Well worth the investment.
Good Luck
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