http://www.sweetwater.com/store/search.php?s=RME+audio%2Finterfaces&Go=SearchOne of many on-line stores.
http://www.rme-audio.de/en_index.php The Fireface UCX operates in three different modes: driver-based USB 2, stand-alone mode, and
Class Compliant mode. (so does the UFX).
You will have to read about any of it.
Of course there are others probably out there also.
http://www.rme-audio.de/en_products_adi_8_ds_mk3.phpYou will have to talk to someone who knows more about them.
I just have the Babyface which is Class Compliant now also, but not Dur-ec whatever record option like the UFX, in which I think you can stick in a memory card (like a camera ?) and record with the unit probably in Stand-Alone Mode all by its self. Have to ask one of the people here that own one or at a dealer about any of that.
Okay found it:
DURec: Direct USB Recording: The UFX provides a spectacular feature: an integrated
digital recorder for all inputs and outputs directly to USB memory devices - USB thumb drives or hard drives with up to 2 TB capacity - via the front USB port. Independent from a connected PC or Mac.