task

I recently wiped an external hd and used recuva for the first time to make sure everything was really wiped. It took 2 seconds and said it found over 700 files, but then when it finished, the report at the bottom says Found 0 Files (732 ignored.) What does this mean? What is it seeing that is giving me the result of 732 files? I want to sell this drive but I'm not going to sell it if the data I erased can be recovered.