External or Internal HD, and DLC?

[BlockABoots]

I am just wondering is it best to have your homebrew apps and backup games stored on the 360 internal drive or best to use an external driver?

Also if i download DLC for say Batman Arkham City whilst in RGH mode, is this DLC made available if i switch the 360 into online/non RGH mode?

 

[Dark Scyth]

I would either use a USB drive or completely different HDD while in RGH and when in retail use a different Hard drive or unplug the USB drive. Also if you download DLC that wasn't originally yours from the marketplace, it will NOT work in retail mode.