TAPEDEV or -t STDIO?

HP-UX 11i v2 Informix 10.00.FC9 ontape -s -L 0 with TAPEDEV set to /dev/null takes 2 seconds or less ontape -s -L 0 -t STDIO > /dev/null still running after 30 minutes Besides the question of "why" is it so much longer when using -t STDIO, my real question is if this archive were to a "real" file (instead of /dev/null), would the time difference be significantly longer as well - i.e. would using -t STDIO > <somefile> take significantly longer than setting TAPEDEV to <somefile>? Brian