What's a good temp for HD's?

[MrToilet]

I have a 120 mm fan blowing over my 2 HD's in my Lian-Li case, but for noise reasons I have the fan hooked up to my power supply (Antec Truepower 430) which controls fan speeds based on case temp. My concern is that the HD's seem to be a bit warmer than before. Motherboard Monitor 5 says that my HD temp is around 35-37 deg. C- is this too high? Should I be worried?

 

[Elledan]

As a generic rule, 7200 rpm HDDs should stay below 40C. Anything beyond this will begin to shorten the HDD's lifespan significantly.

 

[zer0signal667]

I've found that even just by touch, the slightest airflow over a drive will bring temps down drastically.