a few important points:
- as much as possible, get a hard drive that has its own power supply rather than one that is powered by the host through USB. This way it won't overload the power supply of the OSMIO4k. Not that i've heard of it being a problem with that receiver, but I just think it's best practice
- Most external hard drives that have a power supply also have some kind of power switch. Some have the old fashioned toggle or slider switch, with 2 clear positions "on" and "off". Others just have a momentary push button, and the power is controlled by some electronic circuitry behind that. Both work fine, but have the second type, and it has a big drawback: If you lose power, the hard drive turns off, and when power comes back, the hard drive remains off... until you push the stupid button. For that reason, I will replace that hard drive as soon as practically possible as it's really annoying .