i just recieved a WD my book studio drive 500GB first impressions, terrible and wanting to return it back. it wont work except on usb. the only exceptions are Leopard where FW works nicely. XP wehere FW works but still there is a yellow question mark on the drive meaning there is a driver problem. under tiger and vista --- only USB works. so .... i tried to go to WD support pages and download the drivers, but there are no drivers for the firewire. at least i could not find them. for other brands like my book pro, there are options for the drivers. i have the my book pro 750GB and working very nice. from the threads i read here, i figured out that it is a mistake to buy such drive. very awful. anyone can help me with this issue. i dont use USB as all my Macs have FW. thanks.