Hi All, first post here and I hope this is in the right spot. I have a new MAC Pro 2x2.8 10GB RAM and I need help with HD setup. I have a small photography business (mostly weddings) and do mostly Photoshop CS4. I have a 300g WD Velociraptor drive with the Apps and OS in slot 1. I have a 1TB in slot 2 for client image storage, and I have a 320gb hd in slot 3 that is partitioned into a small amount for Photoshop scratch disk and the rest for odd's and end storage and some business backup files. I was thinking of getting an additional 1TB drive to mirror the other 1TB drive. I am looking for security as a primary focus, but I don't want to sacrifice speed. I am looking for suggestions on setup. I am new to raid and MAC, so any help would be appreciated.