Ok so I made a 16GB partition and my 360 was able to format it alright and it reads it fine, I was able to install a game on the external hard drive to make sure. But Horizon doesn't detect it as a device. So I figured my drivers my be screwing up or something as I had previous problems with this particular HDD. I reinstalled the drivers and Horizon still couldn't detect it. So I went into a partition manager I have and kept getting I/O errors, and as soon as the manager loaded up I got some...weird results for the hard drive. It's giving out readings of 2000GB It's only an 80GB HDD, and I was wondering if that's normal? If so, any ideas why Horizon won't detect my HDD?