That is very important for me! I work with confidential files always encrypted with GPG and an RCA key with 4096 bits. By security, I always decrypts the files on the USB drive, NOT on public or private computer or on my notebook. Therefore, deleted decrypted files are always in just one place: the USB drive. However, I need to clean free space (or entire drive) of USB drive from to time to time to erase the deleted decrypted files! Time is very important for me. I can not always wait one hour to clean my USB drive. This is the problem: Time!
From your statement, I can conclude that the "Eraser" fooling me "formatting" my USB drive in only 6 minutes with the configuration below?