I've got one, cause laCie is sooo extremely expensive here, all i did was purchase a hdd enclosure and put one of my old 40 gigs in. Its super quiet, and my mom uses it to back up. Fire wire and usb, but she uses a windows computer, i havent tried with a mac. Anyway, this one, you can turn the fan on or off with a little switch. Even with the fan on, its the slightest of hums. Either way, it makes a raquet when it is on the desk, it kinda amplifies the sound of the disks inside spinning, but when you take it off the desk, it is silent.