DDS tape

Hi, I have a Compaq DDS-4 drive and I can't get it to work. I am able to rewind the tape, but if I want to set the density to for example DDS-2 I get an 'input/output error'. Does anybody know what is happening? Kind regards, Harry ten Berge Test Engineer Holland Institute of Traffic Technology HITT B.V. P.O. box 717 Apeldoorn email :berge@hitt.nl http://www.hitt.nl tel : +31 555432537 fax : +31 555432554