Active partition in factory partitioning schema of a R300 server (SBS 2008 pre-installed)

Hello,

could anybody tell me which partition should be set as 'active' partition on a r300 server with MS SBS 2008 pre-installed by Dell?

The following partitions exist:

• EISA-Configuration (78MB)
• RECOVERY (3GB)
• OS (C:)
• DATAPART1 (D:)

I played around with the active partition due to the SBS 2008 backup problem but did not write down the original state and now I fear the next reboot (which is due) ...

Thanks a lot for your help!

Florian