I have some files I want to keep on a 4 GB USB drive. Just yesterday I put that USB drive into my computer and instead of opening the drive, I got a message saying "The drive is not formatted. Do you want to format it now?"

Obviously, I clicked on the "No" option because formatting it would make things worse. I've tried putting that USB drive into two other computers with the same result.

The files are undoubtedly all still there, but perhaps the file allocation table is corrupted or something like that.

Does anyone know of any good file recovery freeware that would allow me to recover the files on this USB drive?