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There are several ways to organize multiple disks to increase performance and reliability of the disks themselves.

To make a more reliable disc is possible to introduce a certain redundancy of information across multiple disks, so that, even in the case in which a disc has been lost, it is possible to recover the data in an integral manner. If you have multiple copies of files you can transfer multiple files simultaneously.

Structures to RAID
-RAID 0 refers to batteries of disks with sectioning at the level of the blocks, but without the introduction of redundancy. No need for additional disks.
RAID-1 refers to the technique of copying mirror, in the sense that any data is copied in the same way on other media. This technique requires 8 disks, 4 of which contain the actual data and 4 the data copy.
RAID-2 refers to an organization for error correction (ECC). In this type of structure to each byte of memory is associated with a parity bit. In this way you can identify all the errors of a single bit in the memory system.
RAID-3 refers to an organization similar to RAID 2. In this case it only stores a parity bit for each byte, but you can correct damaged bits, if you know the disk that caused the error.
RAID-4 refers to an organization level 0, and also keeps a parity block for each group of 4 blocks of the corresponding disks in a separate disk. The writings of blocks that reference the same parity block can not be executed in parallel.
RAID-5 refers to an organization with distributed parity blocks intercalated with, because the parity blocks are distributed across all disks.
RAID-6 refers to an organization similar to RAID 5, but most stores parity information. 2 additional disks are required every 4 data disks.
RAID-0 +1 refers to a combination of RAID 0 and RAID 1 to ensure efficiency and reliability. Requires 4 additional disks every 4 discs. According to this technique will dissect the data to a disk and is now doubling every section.
RAID-1 +0 refers to a combination of RAID 1 and RAID 0, which makes the mirror copy of the disks in pairs and then the cutting is done in pairs. In this way all the data are accessible even in the case of a single failure, which does not happen with the previous method.

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