Swapping HDDs with SSDs back and forth

[wiggaz]

Hello,
I have a fully functional QNAS 453D with 4 drives installed in RAID5.
I'd like to try and see how some SSDs that I have lying around the house do (as single units or RAID0, I don't care).
Since I want to put the 4 main disks back, what should I do?
If I turned off the NAS, removing the 4 main disks, and then inserting the SSDs, this would trigger a new setup?
Then when I'm done, I could turn off and put back the 4 main disks and go back to how it was before, as if nothing had happened ?

And if I wanted to test the new QTS 5 on top of the SSDs, would there be problems when I reinsert the 4 main disks?
Sorry for the many questions.
Thanks in advance.
Cheers.

[dolbyman]

All settings and os files are on the disks...so if you eventually stick the HDDs back in there, it should come back up the way it used to

[wiggaz]

Even if I upgrade it to QTS 5?
Can I go back to version 4.5.4 contained on the 4 main disks?

[dolbyman]

The DOM is always allowed to be higher..otherwise migration across units wouldn't be possible