What exactly is "raid?"

Qonfused

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I've heard this term tossed around a lot referring to HDD's, but what exactly is it?
 
Google 'Using RAID for hard drives'!

Google is your bestest friend! Don't forget it!
 
I've looked, can't find any I can understand correctly. Maybe someone else can answer it?
 
#1 thing to remember:
RAID 0 improves seek time, not transfer speed.
 
To hear it from a fellow Half Life 2 dot Net member:

RAID stands for Redundant Array of Independant Disks, I can ALSO stand for Inexpensive, both are acceptable.

It usually means, or is meant to mean, that one or more extra disks are used, redundantly, to be used as a failsafe, a backup. If you are using RAID level 1(MIRRORING), then one or more hard drives in the RAID array are basically copying what the primary hard disk is doing. Therefore, if one hard disk fails, you have one(or more) hard disks to fall back, thus you do not have a big loss to cry if such an unfortunate event might happen. However, it isn't exactly a cheap option, as you might have lets say two 300GB hard drives, but only 300GB is being used effectively(as opposed to 2x300GB = 600GB if not used in RAID).

RAID level 0 is not exactly RAID, as no hard disk is redundant.
If you have 2 hard drives, lets say 100GB each, and are running them in RAID 0, then what happens is, data is split up into certain sizes(strips - I think) and spread out over the two hard drives in tandem. Therefore, theoretically halving access/writing times.
For example, you have a mp3 file that is 4MB and you have a strip size of 1MB(stupid size for this example). the first 1MB is stored in Hard disk A, 2nd MB in Hard disk 2, 3rd MB in hard disk 1 again, 4th MB in hard disk 2. This supposedly decreases the time to read the information in half.
Benefit: Great performance.
Letdown: If one hard disk should fail, youv lost everything, therefore a double risk of losing data as opposed to a nonRAID setup.

RAID 0, in my opinion, ONLY speeds up the booting of Windows. At first, the loading bar only goes across two thirds of the way before being prompted for the password. It has also improved Half Life 2 loading times quite a bit.
Aside from that, nothing else, though it does help if you have your paging file on it.

These are the most common used RAID levels, there are others, like RAID 0+1 which involves about 4 or more hard drives, and does both 0 AND 1. And there is RAID level 5, but I forgot, but I do not think the motherboard available to us are capable of such.

As just about everyone else suggested, google RAID and learn, and ask more specific questions if you do not understand any.

I hope what I have said helps you.

BTW, if any of which I have said does not make sense, it's because I have drunk quite a bit. Good night.
 
A group that contains several smaller groups, often used to tackle bigger Instances such as Molten Core.
 
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