After completely filling up a 500 GB external drive with iTunes media for my Apple TV, I've decided that it's high time I not only got a bigger drive, but also came up with a better way to back up all that data. So I recently purchased two 1TB Western Digital Studio II external drives. This may seem like a dumb question, but I have never used or set up a RAID array before so I'm not sure of the answer. Can I set up the two drives as a single RAID 1 drive? Or can that only be done for each drive individually (thereby creating a mirrored RAID across each 500 GB half of each 1TB drive)? I'm trying to think out the process for copying and backing up my files. My first instinct is to set up both drives (that is, all 4 halves) as a single RAID 1, thereby allowing me to copy a file to one 1TB drive and have it mirror to the other one automatically. But I'm not sure if that's possible. If not, then my other option is to split my iTunes library across both drives, setting each one up as a separate RAID 1 for redundancy. My current library would go on one 1TB drive, and as I add more media those files would go on the second. As another option, I can set each one up as a RAID 0 and then just manually copy the file onto each drive - one to run iTunes off of and the other keep as a backup. Any suggestions?