Just thought this was kinda strange and share with others. I removed the 160gb stock drive from the G5 as I had Leopard 10.5.8 installed on it and put it back into my 2009 Mini as I'm selling it. I can't believe that the Mini booted from an APM formatted(Intel used GUID partition scheme) drive and really stunned to see the 2009 Mini boot from 10.5.8 which orginally shipped with 10.6.2! Strange lol. Did the original 2009 Mini ship with 10.5? That I can understand but be able to boot from a non-GUID partition scheme is pretty weird.