Question about external USB drives

I just got ATVFlash up and running this morning. Painless install, everything seemed to work fine. I went to plug in my media drive (Maxtor - formatted for use with a Mac) and the drive doesn’t show up. I plug in a different drive (Western Digital - formatted for Mac) and it shows up fine and I’m able to use it just fine. Anyone with any suggestions as to what might be going on? Thanks in advance.

You can try to unplug the Apple TV and then leave the drive plugged in when the Apple TV is powered on and see if that works. If not, then you can try to hot plug it in and see if it shows up. Do you know when you do plug it in do you hear the drive spin up and the heads moving around like it is accessing the drive? Does the light on the Maxtor drive blink different colors like it being used? Is the drive powered through USB or plugged into the wall?