Well, I'm not familiar with video RAID, but I'll try to respond. (Sorry.)
RAID is an acronym for Redundant Array of Inexpensive Disks. It has different levels, so you an expect to see weird looking descriptions like RAID 0, RAID 1, and RAID 5.
RAID 0 is the performance booster. It involves "striping" or creating a volume that spans disks and channels...thereby dramatically speeding I/O performance. It's also the most risky, in that if you lose one drive, you pretty much lose all your data.
I won't go into RAID 1 & 5 here, since I assume you're concerned with performance, as opposed to redundancy. However, here's a link to a really good site which covers RAID in more detail than you'd ever want: http://www.raid5.com/04_01_00.html