I am setting up a RAID 1 configuration for the first time and would like some help. I purchased 2x 1TB (WD Caviars) and already have Windows Vista Business installed on my 150GB WD Raptor. So, first thing is first, I've installed the two new drives and when I went into Disk Management it requests I initialize the disks. Do I initialize them in MBR or GPT? I don't really understand the difference. Next, would it be better to set up the RAID 1 with the OS on the two drives or leave the OS on the 150GB drive? Finally, can someone provide a step by step guide on how to setup the RAID 1 mirror with this configuration? Should I install NTune? Thanks so much!