I build a lot of pc's, and not very often do I get a cust wanting raid set up with 2x mirrored drives.  But today I did, and found the mobo I had purchased GA-G41MT-ES2L doesnt have any raid options, nor does it mention raid in the manual, so basicly it doesnt support raid, not even with a bios update.  Every other comp ive built ive always come across raid options when configuring bios and boot devices etc but never needed it, not untill today and its not there!  Now its back to the shop to get one which supports raid, and keep this one aside for another pc.