Patrick, It was in the late 70's that I was a young technician on the test line at Century Data Systems in Anahiem CA, I remember when the Trident line first got started (T25, T50, T80) they were the latest in high technology, I was one of the first techs to work on them. These disk drives were built to last, I beleive I have some of the old "theory of operation manuals" for them. Thanks for the memories. Do you have a web page with pictures? I also worked on some of the first disk drives that Century Data made back then, I had 18 years in with them untill 1988 just befor they went bankrupt, at lest that is what we were told. Dave