What size does the parity drive need to be?

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I was surprised you'd have trouble locating this very basic piece of information about unRAID, but when I looked I did not immediately find it either.


Here is a description of how parity works in unRAID.  It will help you understand why the drive doesn't have to be any larger than the largest drive.


There have been a few reports of certain motherboards / disk controllers "hiding" a very small amount of space on a disk drive.  This can result in, for example, 2 500G drives being of slightly different sizes.  Although this is pretty rare, it has caused some users consternation as unRAID will not accept a parity drive smaller than the largest data drive, even if the size difference is tiny (even 1 sector would be too much).

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