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#31
Viewing results
In answer some of your questions:
You'd know if you'd securely wiped files or free space as it would require running software to do it.
If DiskDigger (with the image filter applied) didn't find anything on the USB then yes - it's gone.
If you open the TestDisk results folder and there are a huge number of files to look through try sorting them A-Z by file extension and bulk delete anything that's not an image. Then view the results using something like Irfanview and use the thumbnail viewer. If the file ever existed on your hard drive and TestDisk hasn't found it - then it's gone.
Here's an example of a folder containing a small number of images - sorry but I don't have any folders that contain thousands if images to use as an example.
I'd suggest that USB's are a really unreliable method of storing any important data. They're okay for copies but shouldn't really be used for originals. (In my opinion).