The TE10 uses the TE16 transport with a Unibus TM11 interface. The TU10 used the TU16 transport with the Unibus TM11 interface. The TE16 is the redesigned version of the TU16 with a better tape path, auto-rewind to BOT after tape load etc. The TE10 is the better unit although both are the same spec 800bpi/1600bpi (IIRC) and 45ips (or is it 45ips rewind speed?). I used to do a lot of Field Service on the DEC tape drives and the TE16 was pretty reliable -- with only the tape locking mechanism breaking (same part as one of the Kennedy drives). Bill