Adding additinal HDD on X86 system

Hello,

I m new to Mikrotik and recently i have purchased X86 level6 License and installed on IBM X3100 M4 server and its working fine . ROS version is 6.20.
i tried to add extra internal 2TB HDD for web caching but the server does not boot .
Please help me on how to install the addintional HDD on my server.

Sendil