Intermittant loss of visability to secondary mechanical drive

Anonymous User - Mar 25, 2016 at 03:36 AM
my WIN7 computer loses visibility to my secondary mechanical hard drive intermittently. It re-appears after re-boot. I added a fan and it seems to appear less frequently. What could be causing this?

I have an I7 processor, 16GB RAM with a 350 watt power supply. My boot drive is SSD 250GB