Ok that helps lol.
Make sure your BIOS is set to AHCI mode.
Also make sure your BIOS sees your secondary HDD.
Also have you tried connecting your HDD to another port?
One more thing you could try.
Connect everything. Shut down your computer, disconnect it from the power cable, and now take out your CMOS battery (it looks like a watch battery) on the motherboard. Leave it out for about 15 minutes. Put it back in, and power up your system. Check your BIOS also to make sure AHCI is set.