When i still had a D8 all I ever ran in it were Sony 90m DDS tapes (with the occasional Maxell 90m), and every so often the occasional 60m. Had it for years and never really had any problems (at least none that were related to head wear or problems from the use of 90m). I sent it in once a year to Paul at Pro-Dig for a cleaning and check-up. you can count me as one of the folks who always used DDS, of which the majority were 90m, and was a very happy camper. Now I use a JB3, so I dont sweat that particular detail anymore.