Re: A bit off topic
Yeah, if you whip a drive out of an md RAID1 array and plug it into another motherboard, it just looks like a normal drive with filesystems on it, even if the partition types appear a bit suspect. Not so if you do the same with a drive out of a hardware RAID1 array.
Been bitten that way exactly once, when a RAID controller packed up, and not touched another hardware RAID controller since. (It didn't help that it had previously tried to rebuild its array by copying a pre-emptively swapped in, fresh blank drive over the top of the good one ..... Yeah, that thing you joke about. Brown trousers time when it happens for real. I ended up dd'ing the contents of the removed drive onto another new one, like you're supposed not to have to do, so it wouldn't matter if it tried the same stunt.)
You can also live-swap and grow software RAID1 systems, replacing both disks with bigger ones, with just one reboot (none if the boot drive is not part of the RAID).