LaCie 2BIG NAS User Manual page 321

5. To add the new disk(s) to the RAID, choose Expand storage capacity. Important: Make certain to choose
Expand storage capacity. Selecting Increase security in this window will migrate the RAID from 5 to 6,
and selecting Custom will create a new RAID volume and delete all existing data.
6. Review the summary page to confirm that you are adding the hard drive to your existing RAID volume.
Choose the i tooltip to review the current capacity. To confirm, choose Finish, then Yes at the prompt.
LaCie 2big NAS | LaCie 5big NAS Pro User Manual 321