I bought 2. MAC must first reformat the partition in MAC (via DISK utility) and then choose the option to boot GUID possibly above. By default it comes into HSFS the windows format, but then no problem on MAC. It is very discreet, silent, black. I have a first automatic backup disk TIME MACHINE near my MAC. The 2nd characters only for films and videos. The 3rd as external backup that I keep in my office away from home.
