Ok so I did a 7 Pass erase (to Mac OS Journaled - Extended) of my MBP Hitachi 250 GB stock drive the other day and sold it. The 7 Pass erase went without any problems - at least it didn't report any. But a day later the buyer called me to report that he failed establishing the HDD as a boot-drive on his NON-mac laptop (or whatever it was). Now he's claiming it's either something wrong with my HDD or it's just that Apple "protects" its HDDs in a way so that they can't be completely wiped off or something? He thus wants to return the drive to me, so I wanted to ask you guys is there anything he could try to make it work?