A friend on visit in the US bought a 4TB Seagate drive <http://www.storagereview.com/seagate_4tb_barracuda_xt_first_thoughts_review> On his Power Mac (10.5.8) it will only format or show 1.64 TB. On his Powerbook (10.7) it will show 1.8 TB. Does this mean he can't use the full 4TB? Paul Moortgat