I am new to this forum; But I would Like to correct everyone about the warranties on WD hard drives. I too have the WD4000YR for non-raid system and the first drive failed. Had hard time getting windows loaded, got multi-zone error under diagnostics & S.M.A.R.T.. Then finally the drive went out completely and was making clicking sounds when powered up and would not do anything after. So I am waiting on the replacement.
Anyways, back to my point. Every single one of you are wrong about the warranties including Eugene!!!
ALL WD HARD DRIVES ONLY HAVE A 3 YEAR WARRANTY; EXCEPT FOR THE RAPTOR LINE WHICH HAS THE 5 YEAR WARRANTY!!!!!!!!!!!!!!!!!!!! There is a misprint on WD's Site. I also asked WD when I RMA'd my 4000YR. More proof is if you register the drive it only gives you 3 years, NOT 5. Therefor if you are correct about everything else The only difference is the TYLER Feature; which I find this very hard to believe; but anything is possible I guess.