RAID 0 array - Not a new install of OS

I have Win7 x64 up and running without problem.

I have two 140GB Raptors that I installed in SATA 2 and 3 ports on my motherboard.

I have enabled RAID on SATA 2 and 3 in BIOS.

I have created the array by hitting F10 and opening NVIDIA MediaShield. I selected Striping and moved both drives into it. I reboot and the flash screen says Healthy RAID 0.

I go into Win7 Disk Management and see the drive. However, it sees it as a 279GB drive. When I select create Striped drive, it has the drive (Disk2) in the right side and will only allow me to move Disk 1 (my SSD with OS) into the right side to create the array. Obviously, I don't want to do that.

I then created the drive as simple, formatted it and it is now seen by Win7. However, it is seen as a 279GB drive.

I check in Device Manager and it says 279GB NVIDIA Striped Drive.

So - what am I doing wrong?? Is the NVIDIA software and BIOS conflicting with Win7, as Win7 only sees it as one drive and there is no need to create a Striped drive with Disk1 (or any other disk), because it is actually a RAID 0 array??

Also - if it is working correctly as a RAID 0 array (with Win7 just seeing it as a single drive), why is Win7 seeing it as 279GBs? Shouldn't it being seeing only 139GB since they are in RAID 0 (using both drives at once)??

Lastly - how do I confirm it is actually working in RAID 0?

Thanks,
ERIC