Simply erasing the drive outside of SD! will change its low-level ID. So, yes, if you do that (and just restart SD!, not the Mac), it should be fine; give that a try.
"This problem" -- namely the UUID change -- shouldn't happen at all unless you erase/change the drive at a low-level outside of SD! itself. (We preserve the UUID if you do an erase-then-copy inside of SD itself.)
You haven't yet talked about a drive being mounted/unmounted. Are you trying to unmount the drive?
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--Dave Nanian
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