What's this got to do with triple channel memory?
Anyway, hard disks in RAID 0 means that the disks are striped. Basically, both of them are used to split your data to improve speed at the expense of reliability; if one drive goes, your data is unrecoverable on both drives.
Are you making a mistake? Personally, I don't use RAID arrays at all. I like being able to hot-swap disks between numbers of machines - RAID doesn't allow me to do so. If you don't have data that you'd like to keep for extended periods (pictures, movies, memories) I wouldn't trust RAID 0 to hold them, especially on notebook drives which are more prone to failure. Otherwise, RAID is an excellent option to improve performance (at the expense of battery life, of...