Sony DG60P and DG90P ....and yes I know the party line on these dats, but I have not had a problem in 3 years, with a deck I bought used that had run them for about 2 before that. I also know plenty of people that have not had a problem. With that being said, I understand theoretically why it would cause issues, but I am not convinced it happens in all cases...and if it does, I will get my deck fixed...will have been worth it to be able to run a 3 hour show and not have to swap tapes...