My HDD currently averages 27 degrees C. I bought a heatpipe HDD cooler at a yard sale for 2 bucks. After installing it, my HDD reads 24 degrees C. I know 3 degrees can be significant for CPUs, but is it significant on HHDs? I've seen the same HHD cooler from Zalman sell for $30 and have to wonder if they are worth it.