Yesterday I got a copy of windows 7 ultimate 64 bit, to replace my windows 7 ultimate 32 bit. Before doing this I copied all the important information from my main drive to my second hdd. After doing this I started installing the new OS. After everything finished, my second hdd stopped working with my pc completely. It will not show up in bios. It will not show up under disk management. I have no idea how to fix this, or even if it's fixable.
The second hdd is a laptop hdd from hitachi. model: HTS543216L9A300
The hdd had worked fine for over a month with no problems at all, until I installed the 64 bit OS.
Please help me if you can.