According to Hitachi, 50C is what they consider to be the nominal drive temp, and 65C is the final trigger point for overheating.
Interestingly enough, they figure that running a drive at 35C should extend its life 35-65% (so it can be obsolete even longer...). Overheating to 65C decreases it by about 22-33%.
Also, the document claims that they are measuring the base casting temperature.
Hitachi link
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Everything aircooled
(I honestly don't know why you guys let me stay a member...
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Always folding:
WXP Pro:
KD7R + Palomino 1800+
W2K3:
4x P3 Xeon 500 512KB (4 clients)
Linux boxes:
none
Had to put them to use doing *real* work.