I'm totally new to high-definition video (so go easy on me!)... just been taking little HD mini-movies on my cameras (some will shoot AVCHD-lite). However, I'd like to get into it more, and will likely buy a HD videocamera or one of the Canon SLRs that is HD capable. At best, I'll probably create a few short (< 15 minutes) amateur HD videos each month, and some longer ones a few times each year. This will be with Premiere Pro. My current hardware is a 2009 Mac Pro with 2 quad-core 2.66 GHz CPUs, 8GB RAM, and the stock internal 640GB hard drive. Snow Leopard. I am going to use an Intel 80GB SSD for the boot drive, and will have either: a) two data/scratch disks in software RAID1 or b) 4 data/scratch disks in software RAID10 (I believe this is possible with 10.6, but have read conflicting comments) The disks are pretty fast -- Samsung FD HD103SJ 1TB 7200rpm disks. I already have all 4 disks, but am considering option a) because: a) power savings (about 15 watts... the machine already consumes 140 watts when idle) b) immediate cost savings of about $170 c) decreased complexity of software raid solution / less likely for 'something' to go wrong immediately or after an OS patch/upgrade. d) allows me to mount the 640GB internally as a backup drive - If I go with 2 disks in RAID1 (redundant drives is a requirement for me) and the SSD boot disk, then is it likely I will see any performance issues? - Under what scenarios would having the RAID10 setup show noticeable benefit? - Any issues with having a 'single' RAID0 or RAID10 volume that is used for both video and all of my other data? - Other thoughts?