Spinpoint F4 HD204UI 2TB 5400 RPM working good so far

I can't answer that one for you. Only you know how competent you are at the moment. For me, it was a marathon because I had to have a refresh with the tech stuff with the new 4k hard drives. Then re-learn about making a backup of my Duo, which I wasn't doing and then learning how to use Rysnc to verify. I'll print a list below of a list I made up of procedures I needed to implement to get the job done. I took these instructions from various posts and banged it together. Have a look and decide for yourself how much of it you can pull off without too much trouble. Don't forget I banged 2 new disks in. It might be different for everyone.
For me, it's took a few weeks of posting/research and application. I've tried to help others with my posts above, including links to relevant info needed on other posts. The trouble like I've said is that the clever people who know what they're doing have already answered so many questions and posts already. The problem is then for people who don't know spend ages trawling for the right answers etc.....

Have a look at the list.

Duo Disk 4K Upgrade
1. Back up all data
2. Switch on Rsync and verify with a new backup
3. Update to 4.1.7
4. Make a system config backup
5. Disconnect usb external backup just in case
6. Power down and replace with 2 new discs
7. Should already be factory defaulted, but do again
8. After resync reinstall system config
9. Check start count divisible by 8 on discs for 4k alignment
10. Restore backed up data (note: can't restore whole of "c" volume in one go to the new 'c' volume. Have to do it share by share)


As for the running of the disks, it's too early to tell for me as of yet. Oh, and it does take a lot of hours of just down time backing up and rysncing etc...

I'd just like to say thankyou to everyone that did answer my questions, and to the Readynas clever people who help us along.

mutley