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how does raid work and what exactly does it do?

RAID stands for Redundant Array of Inexpensive Disks. There are a few variations of RAID. The main 2 are RAID 0 and RAID 1. RAID 0 stands for striping. Bascially, you use 2 indentical drive, and tthe computer splits the work of reading and writing files between the 2 drives. It is a bit faster, but there is an increased risk of losing all data because if one of the drives fail, you lose the entire array. RAID 1 is just for redundancy. It also needs 2 identical drives, but instead of striping, the 2nd drive is an exact duplicate of the 1st one. It makes it so if 1 of the drives fail, the 2nd drive will automatically continue running, but there is no performance increase with RAID 1. I really am not a big fan of RAID. If u want a faster hard drive subsystem pick up a 15k SCSI drive. It'll rock RAID 0 badly.
 
It used to be inexpensive and was subsequently changed to independent. Neither is wrong and you will see both terms used.
 
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