Just to note that 7 pass drive wiping is overkill.
One pass is all that is needed with any drive less than 20 years old.
The 7 pass (and even 35 pass) are still included for legacy (and paranoia) reasons. Your choice, but it's your own time that you are wasting.
To back that up I was doing some testing last week and did a 1 pass wipe of an external HDD using CCleaner Drive Wiper and then tried 3 different recovery tools on it. None of them could recover anything.