RAID or Redundant Array of Independent Drives is probably a little too complex to go into here. Basically, there are a number of RAIDs which generally lead to differing effects of fault tolerance and read or write perfomance. RAIDs combine two or more hard drives as one logical drive and are almost always on a server.

As you stated, RAID1 is a simple mirror of two hard drives so that all data written to one hard drive is instantly copied to the other. If a hard drive fails, you "break" the mirror, put in a new hard drive and it quickly copies the other.

RAID5 requires at least three drives and uses data striping to spread data across the logical drive. If a drive fails, it can use the parity it established to rebuild the array when a new drive is added.

RAID 1 + O is This is two or more series of mirrors which are then striped together. It is often referred to as RAID10. (A stripe of mirrors)

RAID 0 + 1 is the opposite: Two or more series of striped drives which are mirrored. (A mirror of stripes)

It is often popular to combined RAIDs. Many IT people will use RAID1 for the operating system and RAID5 for the data.

Well, there you go, I got all technical.

I do need to join that Jeep club. I have a 2007 Grand Cherokee with a Hemi 5.7. That's all I know. What did you expect from a computer geek?

Bert
Pediatrics
Brewer, Maine