Upgrade to 3 Gb disk ?!

Sounds like you have a v1 Duo that does not, and probably will not, support disks greater than 2TB.

What version of RAIDiator are you running in your Duo?

Model: ReadyNAS Duo [X-RAID], Serial: 24M3027R02D00, Firmware: RAIDiator 4.1.6 [1.00a043]
I think it is a V2 actually?!?! How can I tell?

The RAIDiator version 4.1.6 means that it is a v1. Some of them have a v2 on the back but that is a v2 of the v1 ( if that makes sense). Probably just a minor hardware revision but still Sparc based.

The true ARM based v2 use RAIDiator 5.x and up.

It says "RND2000 v2" under it looked it up and found the Netgear page: http://www.netgear.com/home/products/storage/prosumer/RND2000.aspx#two

But how can "maximum internal capacity" be 6Tb as it says there?

As I said, the v2 on the back of yours refers to a minor hardware change. They probably couldn't get a component from a vendor anymore so they had to slightly change some internal hardware, thus the v2 of a v1 Duo.

The link you provided is for a true ARM based Duo (a v2 Duo). Yours is a Sparc based Duo v1 even though it says v2. Naming nightmare!

mdgm has an article on his site where you can tell the differences...

http://www.rnasguide.com/2012/01/09/how ... -or-nv-v2/

brandtz wrote:
Model: ReadyNAS Duo [X-RAID], Serial: 24M3027R02D00, Firmware: RAIDiator 4.1.6 [1.00a043] I think it is a V2 actually?!?! How can I tell?

Netgear regrettably created a lot of confusion when they branded the ARM units as "v2" - since as you discovered, they had used "v2" already for the original Duo model number.

Since you are running 4.1.6 firmware, you absolutely have a sparc-based unit, which is called "v1" throughout the readynas forums and main readynas page.

So it does not support 3 TB drives.