ok, I have a RAID 0, new install, la-*test*-('") BIOS,
and the la-*test*-('") nvidia drivers installed.
to have four SATA drives.
SATA 1 and 2 for RAID 0
SATA 3 and 4 stand alone.
I cannot see SATA 3 & 4.
Make sure that you haven't enabled ports 3 & 4 in Nvidia RAID. The SATA ports on your board are enabled by default, all you have control over is what drives go on the array. If you enabled ports 3 & 4 the controller will get all mixed up. Leave 3 & 4 disabled and they should show up.