New scsi drives not seen during Win2k3 Server install

We have a IBM x346 server that had two scsi 36gb drives, that were mirrored. I removed both of those drives and installed two new 73gb scsi drives. If I go into the scsi utility during post (Ctrl+A), it sees both drives. When I boot off the win2k3 install cd, and press enter to install windows it says that it did not detect any drives. What step am I missing, do I need to boot off a floppy and install some drivers first? I just want to install a fresh copy of windows on the new drives then mirror them.