I have two hard drives that came out of a dead PC. The owner wasn't aware that there was two - obviously the supplier had spanned them.
I tried to recover the data off them buy putting them into a USB cradle and copying but the partition info was screwed. I used a couple of tools to do some file recovery - the most successful being R-studio. It was during this that a guessed the two drives might have been spanned. R-studio has a nice RAID rebuild option that seemed to successfully find the spanned partition and let me copy the data.
However - ideally I would like to be able to rejoin the drives so that I can use imaging software (storage craft) to put the whole working OS and Apps onto another drive/system.
I have put them into another system as second and third drives and the OS sees the two drives - but doesn't automatically rejoin them - I haven't initialised (as windows suggests) - basically I am yet to do anything that will WRITE to the drives.