Has anyone had luck installing these 80's as secondary drives in a MkIIa? Has Paul or anyone else tried filling the 80 to capacity to see how the fid count holds up and how the caching is stressed?

I'm interested in tossing an 80 in with my 30gig player (though I currently only need a few more gigs, why not go for broke right?). I just don't want to break the good ol' warranty seal, thus deflowering my perfect "new in box" player. Decisions decisions: erase some tracks off CD's that I don't really like, or get an 80?