Adding additinal HDD on X86 system

Hello ,

I m new to Mikrotik . I have purched X86 level 6 ROS and installed it on IBM X3100 M4 server , ROS version 6.20.
its working fine, i tried to add extra internal 2TB HDD to enable web caching service but the system does not boot.
Please help me on how to install the additional HDD on the server.

Sendil