Adaptec 1420 SA Problem

Hy,

DELL Server SC 430 Poweredge with Adaptec 1420 SA.
Two S-ATA Drives with 1 TB each device as RAID 1
with 938 GB.

DSS Lite shows under "Status" the right controller, but does
not know something about my drives :-(
I can not build any volume or configure drives :-(

The latest BIOS Version in RAID Controller is installed.

Any hints?

I have an supported Adaptec 2610SA and have the same issue.
It would be great when some of the open-e staff could point us in way.