Whadya mean the left hand doesn't know what the right hand's doing?! IIRC TiVo's web site instructions say to unplug TiVo before connecting or disconnecting an eSATA drive. I'd say you're safe either way. Plug and pray should work without powering TiVo off, but it will surely work if you do...that's the way it's been done for quite a few months now. Good stuff! Either way, enjoy the new real estate!