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What is Disk Copy?
If the disk assigned as the source disk already has been
partitioned and has data stored on it, and then a second disk is added for
redundancy. The data on the source drive can be copied to the destination
drive, so the disks are identical, and all subsequent data will be written to
both drives as a Mirrored set. If, however, the source disk does not have data
already stored on it, there is no need for Disk Copy.