my unit was in Iraq from January to May of last year. We didnt get the hottest part of the summer, and had cooled tents/buildings/CHU's to hang out in (cake AF job =)
we never lost any HD's to heat - (we also kept them inside).

Other than buying a toughbook(?), I'm not sure that anyone makes an 'expanded operating temperature' hard drive- so just get a drive you like and try to take care of it.

-John

__________________
2009 Kia Sedona
2009 Honda Odyssey EX-L
12006 Jetta Pumpe Duse
(insert Mercedes here)

Husband, Father, sometimes friend =)