Setting up OWC Mercury Dual-Raid

I'm having problems setting up my drives in the OWC enclosure.

When only one HD is connected, disk utility shows the enclosure and that 1 hd (both work seperately).

When both are connected it shows the enclosure with no drives and a 2TB capacity. The drives are 200 &300GB and connected through FW800.

Both drives are set as Master (I read something that said I should do that).

Anyway, if I try to erase or partition the '2TB OWC Enclosure' in diskutility nothing happens and the hd's eventually spin down.

I would like to use these drives as JBOD.

What am I doing wrong? Thanks.


EDIT: I tried Master/Slave again and it works..