I have a similar configuration without the cdrom drive, just 5 hard drives. I went into southbridge chipset configuration, SB SATA configuration and changed SATA IDE Combined Mode from auto to disable. Once I made this change I was able to see all 5 hard drives in my raid utility.
Hi there, thanks so much for this response. I had figured it out a while back doing it the method you described, but forgot to 'case close' it. I also setup a system disk in a similar fashion (configured it to be 'Raid Ready' in the Option Rom utility) since when you turn off IDE combined mode it 'kills' all the sata discs.
Thanks again bud!