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Old habits die hard though so I reckon I would do either an ATA Secure (H/W) Erase first or a single pass of pseudo-random bytes (S/W Erase) so the non-zero mapped out sectors that might get or be mappable back in again don't stick out like dogs balls amongst alternatively zero-ed sectors even...

Good article. I knew this But technically one overwrite in software is (either) not good enough (or unnecessary if you use the right hard drive ... further follows)! An ATA Secure Erase should performed which erases those mapped out dud and flakey sectors dynamically mapped out by the HDD...