I have a 400gb WD mybook. I got a sata extension cable, hooked it up and it didn't work. PS3 didn't recognize it. I hooked up my original 60 gb w/ the ext. cable, no problem. I tore apart the mybook and realized there is a jumper to switch between sata 150 and sata 300. switched the jumper to 150 setting and it worked. I haven't read otherwise, I'm assuming ps3 won't work with a sata300 drive. Unless that's been fixed in a recent firmware, I was at 1.7, I think, at the time. Hope this helps.