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Assume that I fully encrypt an unused USB (FDE), then format it and copy plaintext files. If the files are deleted from USB by using a secure wipe, does FDE that was first applied decrease the possibility of recovering files?

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    Well, it certainly decreases the possibility if you don't decrypt the drive.
    – schroeder ♦
    Nov 3, 2019 at 16:41

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Not really, no.

I'm reading this version of the question as

I fully encrypt an unused USB (FDE), then format it

equivalent to randomize then format. Then

files are deleted from USB by using a secure wipe

boils down to simply how good your secure wipe functions. The past history of the media can make manual examination a little bit more difficult as zeroes are easier to filter out than random. But the bottom line is still how well your secure wipe functions.

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