I'd love to run an data salvage application on a used Mac, just to see what kind of interesting stuff my former owner once had on the system... Just think, if he/she had sensitive data on there.. imagine how much it could sell for? HAHAHAH!!
[evil grin]
Personally, I never use the default HD Apple supplies, as soon as the Macs arrive the first thing I do is swap out the drives. Restoration for me would be as quick as swapping the drives out. 🙂🙂