Hi, I tried to do a search to find a solution and came up with nothing. Anyways, I just got my Retina MacBook today (yay) and was trying to transfer the data I had backed up from my old late 2008 unibody. It's recognized perfectly fine on my older MacBook, and even on my Xbox 360. No, it won't recognize in disk utility on here either. I even went to the WD site and downloaded the drivers and restarted and still nothing. Has anybody that has had this issue found a solution? Thanks Oh, and the drive is on when plugged in to my MacBook, the white light and the drive whirring. My old Macbook was still running on Snow Leopard, btw, and yes it is formatted for Mac.