Alright, I have a firewire laptop hard drive transfer drive thing pictured below.
http://s86978102.onlinehome.us/firewire.jpg
How it works is you plug the laptop drive into the ide part and then hook up firewire cable on the other end.
Is there anyway this could be modded into the empeg ide cable so that if the empeg is off and you plug firewire cable into this adapter the drive will be picked up by windows or whatever. There is no power cable for it, it gets its power through the firewire cable.
Cause i figure if you since the ide cables are just wires you could join the ide cable from the empeg and the ide connector of the fireware adapter together, and as long as they aren't both powered at the same time it should work.