Black Hole
May contain traces of nut
Can't do any harm, for peace of mind.Would it be worth posting SMART details etc once it's installed (& assuming it's working) in a new box? I'm really not sure how to interpret the disk test results myself.
Another idea: you might find you can make the machine boot by disconnecting power to the HDD, booting, and then connecting the HDD after boot (and don't turn it off).