Raid is a great way of using multiple HDÂ’s to make data retrieval faster, more secure, or both. The three raid setups are called Raid 0, Raid 1 and Raid 0 + 1. Raid 0 is the fastest option, as it puts half of all files/folders on each disk, (of a pair), so when you recall the info, you get the data almost twice as fast as using a single disk.
Raid 1 is a secure method, where the whole file is copied to both disks, so in the event of disk failure, you will always have a copy of the data, (in raid 0, you lose everything with a disk failure).
Raid 0 + 1 is a ‘best of both worlds’ but you need 4 HD’s to use it. It basically uses 2 HD’s in Raid 0, with the other 2 drives in Raid 1 with each of the Raid 0 drives, allowing fast data retrieval, with good security/redundancy, (hence, 0 + 1).