
Add the pair of 10tb drives to the 4tb volume.Copy the 4tb of content from the 10tb volume over to the 4tb volume.Initialize the pair of 4tb drives as a volume (you cannot add smaller drives into a volume with existing larger drives).Copy the contents of the 4tb USB drive onto the 10tb volume.Initialize the pair of 10tb drives as a volume.Because I didn't have an extra 4tb lying around, it required the following: This was a bit complicated, because I was planning to use the pair of 4tb drives as well as the new 10tb drives with a total capacity of 18tb and single drive failure.



It was finally time to move away from an old laptop with a pair of 4tb external USB drives onto something a little more permanent. I've finally pulled the trigger and purchased a Synology DS1520+ along with a pair of 10TB NAS hard drives.
