Try the HDTEMP program.... it's definetly more developed and they have a supported HD list avail.
But, I'd bet your HD doesn't support the Temp feature....
If you don't sandwich your HD against other deviced (optical drives, other HD's, etc) and you employ 1/2 decent cooling in your case, your HD should be fine.......
Assuming your case has room for some standard fans, pick up some Panaflow fans which are very quiet and move air well......
There's tons of info out there on how to cool your computer......and common sense is key.
Good luck!