You can enable recording to an EHD. They would not show up on the main DVR menu.
I'm pretty sure you can't record directly to EHD. You record to the internal drive then move it to the EHD. Correct me if I am mistaken but I've never seen the option to record directly to EHD.
Menu 8(preferences) 5(record Plus erd setup. Has an option to record to external device. If you enable it, the EHD shows up as an option along with TV1 and TV2 as a destination when you set up a timer.
Nope. That option was for the old Pocket Dish and Archos (External Recording Device). Will not send to an EHD. Setting is useless.
Oh well. I thought I had discovered something. It would be nice to be able to do it.