I deleted (normally, no added layers) about 100 gigs on a 1 terra external hard drive. I then formatted the external hard drive. Now I would like to make sure those files are not going to be recovered. I tried with Eraser, did it in 5 seconds, said "done and imcomplete" or smth similar. Guessing it's because there are no visible files on there. Is there a way to avoid 10 days, what my CCleaner says it would take to wipe the whole drive? How can I delete and overpass just the data with Eraser? Many thanks.