Getting LSI MegaRaid controller to use UEFI partition beyond 2 TB

I have a Dell Precision workstation that needed a new RAID controller. The closest match available to the one in the system would not recognize the foreign drives and array from the old controller. I created a new 9TB array, downloaded the OS (Windows 7 Ultimate) to a flash drive. That's how Dell shipped the system. I can boot the OS with an MBR-formatted USB stick that sees UEFI. I have the driver for the RAID controller, and the computer sees the controller and the drives after the driver's loaded. However, it won't see a partition larger than 2TB, and won't format/install WIndows on any partition/space on this array.
Questions: Using Rufus or some other such tool, how do I put the OS on a stick that'll allow it to see and USE one large partition (or maybe two smaller ones, but use the entire 9 TB)? THANKS! :)