Im preclearing a new parity drive.
i will place the old parity to the data.. Do i need to preclear it also?
or can i format it or just leave it alone and add it?
Unless you want to test it for some reason, no need to preclear. However, if you add a disk that is not cleared to the array, unRAID will clear it before you can format it. An added disk must be clear so parity will remain valid. A clear disk is all zeros so has no impact on parity.