Dear mnorth,
Inorder to expand your RAID capacity, you first need to a RAID migration.
If you currently have RAID 5, you will not be able to migrate to RAID 6,
however, you can migrate the two new disks at the same time to RAID 5.
Before you migrate, please click
here and get the latest firmware for N7700 v2.01.09
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Official Thecus Support Representative