I need a new external harddrive. There is a Seagate ST3500841A-RK 500GB RTL Ultra DMA/100 HDD ATA/100 and a Maxtor 500GB SATAII ATA/300. I have a powerbook g4 that'll it needs to plug into with FW 400 (I have the external drive enclosure). Can I even run a SATAII? Or will it run, but just at a SATA speed?