Besides all my active HDs are in quick remove trays.
Demil by writing over at least 7 times.
My empty space get written over 7 times for general space saving and prepping for defrag.
Erase 32 times for totally cleaning the drive.
If I am letting an old computer go to the bone pile I erase 32 times and take a sander to each side of each disk and bang em hard with a hammer then I toss the leftover pieces in various garbage bins, nowhere near my home or business.