Hi, I have an Optiplex 7010 mid tower. I have 2 hard drives installed one is 500GB seagate and the other is 320GB Hitahi. And I have 2 problems.

1.- The Hitachi HDD dosent appear on windows if I reboot the PC.

2.- I want to install another 500GB seagate drive. So the drive is plugged and spinning,is detected in the bios but not by windows. 

Any help? Please.

System config:

i5 3550 

8GB DRR3 1600

Windows 10