I've tried to install en_win_srv_2003_r2_datacenter_x64_with_sp2 but it could not recognize built-in hard disk in B200 blade. Is that a feature or I'm doing something wrong? Or to reformulate my question, is there a special driver for this and where it can be downloaded from?
You'll need the driver iso from cisco.com and then load the LSI controller.
Follow the instructions in this guide and you should have no issues: