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).
Make sure you have 2 Hard Drives (preferrably identical) to the Marvell controller and on boot-up, Hold down CONTROL and press "M". See if you get anything. Please reply either way!
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 !