Installing of two SSDs in Mac mini mid 2010 (core i5 2.3GHz)

I have mac mini mid 2011 with code i5@2.3GHz

I have tried to intall two SSD disks in my mac... but without success:

I have opened my mac, and installed both two SSD disks (OCZ Agillity 3, 120GB). Everytning was good, till I turned on my computer: both SSDs are recognised, but one of them (this on the second SATA port) I'm not able to partiton or format.

I have opened my mini again, connected the disk to my Macbook Pro, and installed OS X 10.8 without any problems. I have put it back in the mini - same problem again: SSD is recognised, partition not...

At last, I have installed my original HDD (500GH Hitachi) on the second drive bay, and now it works fine...

Is it possible to have two SSD disks installed in my mac mini?

My plan is to install two SSDs and to configure RAID-0.