Sata Raid called 'SCSI Disk Device'?!

Just built a new PC. RAID 5 with 3 x WD Caviar Black 640GB Harddrives. Two-Way CrossfireX, Radeon 4850. Phenom II X4 3.2 GHz. Asus M4A79T Deluxe.

Anyhow, thought I'd try out Windows 7 on my new comp. It took some work, but I got the RAID drivers on a USB and was able to install. However, when I look in the Windows Device Manager, it displays "AMD 2+1 Disk RAID5 SCSI Disk Device". Why does it call it a SCSI device? I spent money and time so I could have a sick fast SATA 3.0 RAID 5 setup, and Windows is calling it a SCSI disk device? Did I do something wrong? Should this be of concern? Is there anyway to test and confirm that my transfer speed are indeed 3GBps to my Sata RAID?

Thanks for your help