3TB RAID1 array problem

[vin_g]

Building a new rig:
Asus P8Z68-V Pro/GEN3
i5-2500K
2 - 3TB Seagate Barracuda (SATA 6 - on Intel controller)
CM H80
16Mb Vengeance C9 (4x4)
EVGA 560 OC
CM TX650M

Followed the mob manual in setting up RAID in BIOS, then went to IRST utility as instructed. The screen displays accurate info as the RAID volume is None Defined and the Physical devices do indeed show the two 3TB drives. I hit enter to Create RAID Volume. I'm able to select RAID1 (mirror) option but when selected the Disks: item is grayed out and does not allow me to choose the disk to include. Same for RAID0, only Recovery level enables access to Disks:

What am I missing?

 

[vin_g]

Does it make any difference which controller on the mobo I plug these into - Intel or Marvell? Is one better than the other?

 

[vin_g]

So I'm now at the point where I have to designate the volume of the remaining 746.52GB on Disk1 and I'm stuck. How do I get this last piece of unallocated disk space, allocated? What's confusing me is when I launch Intel RST (version 10.8 - latest off the Intel site), it indicates both drives are operating properly and have 2,861,xxx bytes available, so what am I missing. Device manager does not show the 764GB as available.

Assistance is very much appreciated.

 

[lafontma]

So I'm now at the point where I have to designate the volume of the remaining 746.52GB on Disk1 and I'm stuck. How do I get this last piece of unallocated disk space, allocated? What's confusing me is when I launch Intel RST (version 10.8 - latest off the Intel site), it indicates both drives are operating properly and have 2,861,xxx bytes available, so what am I missing. Device manager does not show the 764GB as available.

Assistance is very much appreciated.

My computer -­> Manage > Disk Management > right click new partition, etc

 

[vin_g]

The Unallocated piece only has Properties - all other options are "grayed out" and not accessible.