If you should run an exabyte 1×7 robot and get an error message like:
libTool V1.62 - (c) 2002-2004 Exabyte Corp.
/dev/sg0 - Device recognised as Exabyte Magnum 1x7
/dev/sg0 - Closing the door...Sense=04H [Hardware error], ASC/ASCQ=44H/00H
Internal target failure
Failed
when you try to load a LTO tape, then make sure, that the Barcode faces IN. The arrow on the cratridge might lure you into doing it the other way round and will result in this cryptic error message.