I cloned my N800 into a miniSD, using a SD adapter, and inserted into the N810, and booted up just fine. Now if you want to do a reverse clone, i.e., to clone from the miniSD into intFlash, you can try this

1) in order to do reverse clone, i.e., to clone your intFlash from your SD, you would have to squeeze the rootfs to below 516 MB, this is probably the max when compress to fit in 256 MB of your intFlash/N810. If it is bigger than your intFlash, it just fail, and you would have to squeeze it smaller, this will NOT brick you N810 even if your miniSD rootfs is too big.

2) dl cp12wf.sh, this will help to clone from your miniSD to internalSD

3) fix your bootmenu so that you can boot from either intSD or extSD

4) now bootup from either SD, and reverse clone to intFlash.

Once you invest time to do this, you will have unlimited one button backup anytime you want, great for testing beta programs that can be nasty to uninstall.

Mine N810 and N800 are running exactly the same, and I take turns to take them out, ie., I always has the other on charge and take the full charged one when I go out.

The clone.sh does NOT do partition, it does formatting. So you would have to partition to the right size for the clone.sh to work. And the advantage is one only write over the OS, and leave all your fat16 or fat32 intact.

bun