No.
Depends on RAID type and/or controller. Crappy controller/software RAID = all drives may be visible, not the RAID unit.
Good controller (True RAID) = only the unit is presented to the OS.
I concur with Corky. ANY RAID controller, if configured properly, will show your RAID array as a single disk. So, if you're running two Seagates, two Maxtors, two WDs, whatever... the RAID disk appears only as what the controller labels its own volumes.
So, a chitty VIA based RAID controller appears as either a VIA SCSI RAID volume (or other such name), and a Silicon Image 3112 appears a a SI RAID/SCSI fixed disk device. The brand name of the drive is only visible if you use the manufacturer's tool to inspect each individual part of the software based array. As far as I know, VIA and Silicon Image are some of the cheapest software based RAID controllers out there, and I have used both of them. They work, and the drives themselves are not visible without using the tools available to inspect them. Windows just sees the RAID disk.