Parity drive

For example, RAID 3 uses a parity drive to create a system that is both fault tolerant and, because of data striping, fast.

[1] Basically, a single data bit is added to the end of a data block to ensure the number of bits in the message is either odd or even.

[2] One way to implement a parity drive in a RAID array is to use the exclusive or, or XOR, function.

XOR is a Boolean logic function which means 'one or the other, but not both'.

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