Upgrade to Ultra 4 Plus, Max storage capacity

Steve 46 wrote:
or is it expanding the volume to include the two new hard drives and keeping the data intact?

It's doing this. It's detected that you've migrated the disks and is keeping data intact.

Steve 46 wrote:
Frontview never gave me an option otherwise and I was afraid to open the setup wizard for fear that it would interrupt this restriping process.

Interrupting the process would be to e.g. power off the NAS. Opening Frontview would not interrupt this process.

Steve 46 wrote:

I would like to ensure maximum expansion capacity as StephenB had mentioned and wanted to make sure what is happening now will allow for that or if I will need to actually do a factory default and wipe after this initial restriping process is completed. Bummer if that is the case because obviously you all know how long this takes. Also, the NAS drive still shows up in the Finder on my mac and shows all the shares I previously had setup on the Ultra 2 Plus. Is this normal?

Yes it's normal. You can migrate disks as shown here: http://www.readynas.com/kb/faq/boot/how_do_i_migrate_disks_over_from_an_existing_readynas_to_another

However if you have your data backed up and want to start open from a clean state, there is no need to wait for the current syncing to finish. Open RAIDar now, click setup and go to System > Update > Factory Default, select to perform the factory default and follow the prompts. The NAS will restart and give you a 10 minute window in which you can choose the RAID mode via RAIDar (need to click Setup) and after that will wipe the disks and setup the RAID array.

One more thing. What version of RAIDiator is on the ReadyNAS?