I bought the 40gb gxp last february. 6 months in use it started this very loud whine. now, 10 months after purchase I can't stand it. and my microphones in my studio can stand it even less! I'm getting the barracuda V 60GB. yes, I'll suffer performance-wise, albeit not much, but I'll be sane. that's a fair tradeoff.
hope my 80gb 120gxp will stay workable for some months more though, before I replace it with a 240gb barracuda VII