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Why is RAID so fast?

post #1 of 37
Thread Starter 
Alright i have heard that RAID 0 is fast because it splits up the info on the drives. Well wouldn't it be slower since instead of having 1GB of info in a single place, ther is 500MB of info in 2 places? Would just getting it from 1 place be faster since the disks would have to "search" around as much?
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post #2 of 37
As long as you keep you disks defragged there would be no reason to "search" around the drive.
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post #3 of 37
Thread Starter 
Ok, so basically the HD only has to load 500MB instead of 1GB so its twice as fast?
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post #4 of 37
You can read from each drive simultaneously.

It's like your computer has a 2nd set of eyes to see everything.
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post #5 of 37
That's the trick... it takes time to search. So rather reading one sector and then searching for the next one.... RAID0 allows one HD to read/write while the other HD is already starting to search for the next sector.
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post #6 of 37
Thread Starter 
ok, now i can explain it to my dad, he didn't understand, thnx guys
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post #7 of 37
Quote:
Originally Posted by DuckieHo View Post
That's the trick... it takes time to search. So rather reading one sector and then searching for the next one.... RAID0 allows one HD to read/write while the other HD is already starting to search for the next sector.
Isn't that how Raid 5 works?

I thought in RAID 0, both hard drives were doing the same stuff. 64k on one drive, then 64k on the other drive, back and forth, and so it reads the information sequentially on both drives, but at the same time, thus being twice (or close to) as fast.
post #8 of 37
Yeah, RAID 0 has the stripes on the same physical locations on both drives. You could say that at any given time, if you were to freeze the hard drives in place, the heads would be at the same sectors on both drives.

RAID 5 also has the stripes at the same spots, ONLY Difference between 0 and 5 is redundancy. 0 has none, 5 allows 1 disk to fail.
post #9 of 37
also raid 0 allows both drives read/write heads to be used simultaneously (doubling the amount of info that can be read/wrote in a cycle)
post #10 of 37
Quote:
Originally Posted by SgtSpike View Post
Isn't that how Raid 5 works?

I thought in RAID 0, both hard drives were doing the same stuff. 64k on one drive, then 64k on the other drive, back and forth, and so it reads the information sequentially on both drives, but at the same time, thus being twice (or close to) as fast.
No... RAID5 is one disk writes data, one disk is seeking, and one disk writing a parity.
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