>I'm not too sure actually what RAID means, apart from that it reads
>different disks at the same time?
RAID == Redundant Array of Independent Disks
A collection of several physical disks that operate like a single disk drive. The "Redundant" part refers to the fact that most RAID arrays provide fault-tolerance: one physical disk can fail and the RAID array will continue to function.
See
FOLDOC for more details.