Cloning w/HBS

[Froggie]

Greetings!  I just started playing with your cloning feature.  First attempt... problem.  I kinda understand why it won't allow OS disk cloning to an external USB disk, but I don't understand the error msg that states destination disk is too small to clone a single Partition when the source partition is smaller than the destination disk, but originates from a larger disk.  Why wouldn't that be allowed... we're only dealing with a single partition clone?

Thanks in advance for helping me with my confusion...