I too am having an immediate failure with SCAN DISK. Even after a restart (it forces you to restart when it fails), it still fails.
I have two 1.5 Seagate (ST31500541AS) running RAID0 with 1.08 b8. I have static IP, Jumbo Frames 6000, NTP set, FTP started, Bonjour Add-On running, iTunes server on and UPnP/AV running.
I guess I will try a factory restore and see what happens...