If the drive is to be reused, DBAN is the only way to go. I've done the fullest wipe with it a few times, one 500 GB drive took about 4 days to complete the wipe.
Normally one pass with the default setting is enough to hide data from all but the most advanced equipment, the kind only an NSA or FSB (KGB) would have.
If the drive is not to be used again, I'll wipe with DBAN anyway, then pull the platters and rings out to make a mobile with it.
My wife made a great mobile out of about 20 platters of differing sizes, and hanged it in a southern-facing window. The reflections of bright light zoom about the walls, floors, across counters... dozens of spots sometimes all moving randomly, jerking to a halt, sometimes moving on, other times reversing course.
We have 10 cats, 2 of them months-old kittens. nuff said (things do get broken on occasion)
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