I have a Dell R420 with a PERC H310 RAID controller.  This controller allows me to create either one Virtual disk using all of the available space in the RAID 5 array or it allows you to build two Virtual disks that split the RAID 5 array space.

If I create one virtual disk, and install Windows 2008, this presents to the OS as one physical disk.  I could then use the OS to partition the space into a C Drive and an D Drive. (both on the same "physical" disk).

If I create two virtual disks and install Windows 2008, this presents to the OS as two physical disks.  I could put the C drive on the first "physical" disk and the D drive on the second "physical" disk.

Are either of these options better than the other from a performance or other perspective, or are they about the same?