Correct. I lied when I said you can't add single disks, I meant you shouldn't add single disks. It's not like e.g. Synology where you can add a single disk and

Correct. I lied when I said you can't add single disks, I meant you shouldn't add single disks. It's not like e.g. Synology where you can add a single disk and it will expand your underlying RAID5/6 arrays