I suspect the codeset in the supplied remote just doesn't have that model. You might be happier with a third party remote like a Harmony.
As for why you can't use both internal and external drives, it's just not set up that way. It's not like a PC which is designed to use multiple drives. I grant you, DISH does it that way but the DIRECTV boxes just were not created with that in mind.
As for why you can't use both internal and external drives, it's just not set up that way. It's not like a PC which is designed to use multiple drives. I grant you, DISH does it that way but the DIRECTV boxes just were not created with that in mind.