[Darthtanion]

It is simply a means to connect two hard drives together and fool the system into thinking it is a single drive of a size equal to both the drives. The two drives used to have to be the same size, but the new JBOD standard allows otherwise. It also allows the data to be written to both drives at the same time, enhancing performance.

This is very basic, but gives you an idea what RAID is. BTW... the acronym stands for "Redundant Array of Inexpensive Drives". Older gurus will remember the I as meaning "Independent", but this has changed with the advent of cheap hard drives.

There are benefits and disadvantages to it, but you'd do better doing a Google search for more in depth discussion.