No matter what drive I imagine to go missing the math still works. That makes a lot more sense in mathematically representing the data accross drives than what I came up with. Wow that's actually really smart and cool!!! So much can be done with just 2 numbers. Now you can imagine, if any one of the 3 disks go missing or malfunctions, Using the information on the other two disks you can reconstruct the data on the lost disk. So the first bit on the parity disk is 0.įor the third bit, disk 1 is 0 but disk 2 is 1. The XOR of the first bits disk 1 and disk 2 is 0 since they are equal. In my example the first bit of disk 1 (left to right) is 1. Parity is a 3rd disk that stores the logical NAND operation of each bit on the othet two disks.
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