RAID : Computer Hardware Buyers’ Glossary

*0-9ABCDEFGHIJKLMNOPQRSTUVWXYZ (all)

RAID
RAID (Redundant Array of Inexpensive Disks).

RAID comes in several levels: 0, 1, 2, 3, 4, 5, 6, 10, 50 and 0+1. For home use, you are probably only interested in levels 0 (speed) or 1 (safety).

RAID is usually handled transparently by a hardware RAID controller. The software thinks it is talking to a single disk. Software-only RAID is a rather dangerous feature to use in Win2K.

RAID comes in several levels:

RAID Levels
RAID Level Minimum
Number of
Disks Needed
What it Buys You How It Works
0 2 extra speed interleaved striping
1 2 extra reliability hot mirror backup
2 2 extra reliability Hamming code ECC disks. No commercial implementation exists.
3 3 extra reliability parity info enables correcting errors on the fly
4 3 extra reliability shared parity disk
5 3 extra reliability stripes both data and parity info
6 4 extra reliability Independent data disks with two independent parity
10 4 extra reliability and speed striping and mirroring
50 4 extra reliability and speed Ganging RAID 0 and 3 together.
0+1 4 extra reliability and speed Ganging RAID 0 and 1 together.

For home use, you are probably only interested in levels 0 (speed) or 1 (safety).

With a SATA (Serial ATA) drive, you need a SATA-capable, RAID-capable motherboard or add-on PCI (Peripheral Component Interconnect) SATA controller. You can also use SATA on a single disk without RAID. SATA drives are pretty well standard now. Of course, for RAID, you have the added expense of twice as many drives.


This page is posted
on the web at:

http://mindprod.com/bgloss/raid.html

Optional Replicator mirror
of mindprod.com
on local hard disk J:

J:\mindprod\bgloss\raid.html
logo
Please the feedback from other visitors, or your own feedback about the site.
Contact Roedy. Please feel free to link to this page without explicit permission.

IP:[65.110.21.43]
Your face IP:[54.204.198.71]
You are visitor number