The DZ68BC has also a Marvell SATA controller. It is possible on that mobo to enable it in the BIOS and then to enter the BIOS screen of the Marvell RAID.
I was not very impressed with the software\drivers of Marvell and I am only using the Intel controller (2 harddisks are in RAID attachted to the 3G ports, SDD to the 6G port).
The download page of your DZ77BH-55K shows an updated driver for your Marvell controller from 2012-5-23 which is the same driver as for the DZ68BC and it should support RAID. The link to the marvell pdf is however very old (document from 2006).
I have the same problem mentioned by z77_user.
I unable to setup Raid on internal Marvell controller in the DZ77BH-55K motherboard.
I connected two Seagate HDDs (1TB, Sata3) to the appropriate SATA connectors on my motherboard but I cannot define the Secondary SATA Mode to the "Raid" value in the Intel BIOS - it always show the <AHCI> value for the Secondary SATA Mode field in BIOS. And this value cannot be changed.
I also cannot invoke the Marvel Raid BIOS during POST using the Ctrl+M keys.
The current BIOS version of the motherboard is 0091 (I updated the BIOS to the version 0091 from version 0057).
Has anyone solved this problem?
Please help !