How to Setup a RAID System

External references:   Setup a RAID System
To setup a RAID system, you need a raid controller and at least two identical hard disk drives. A RAID controller is a hardware device responsible for managing physical drives in a system. Some specific cards are
(check your motherboard menu if any embedded raid controller before buy  a new one)

HighPoint RocketRAID 2300

3ware 9650SE-4LPML

PROMISE SuperTrak EX8350 RTL

Areca ARC-1220

RAID 0 (block-level striping without parity or mirroring) provides improved performance and additional storage but no redundancy or fault tolerance (making it not true RAID, according to the acronym's definition).

In RAID 1 (mirroring without parity or striping), data is written identically to multiple disks (a "mirrored set").
RAID 6 (block-level striping with double distributed parity) provides fault tolerance from two drive failures; array continues to operate with up to two failed drives.

On motherboard setup, you need to  configure hard disks as “RAID” instead of “IDE”.

Software-based RAID: creates virtual storage devices from the physical drives, operating system dependent.

Hardware-based RAID: A hardware implementation of RAID requires at least a special-purpose RAID controller. On a desktop system this may be a PCI expansion card, PCI-e expansion card or built into the motherboard.

video: Software RAID 1 (Miror) Setup In Windows 7