Machine Doubling is mashed down to the surface of the coin. On doubled dies the doubling is in 3-D relief just like the primary devices.
Maineman brings up the other more or less obvious point to consider.
I would recommend purchasing one nice example of a real doubled die and studying it closely. It will solve all the confusion quickly, and if this is your hobby of choice, it's a necessary step to understanding the difference. You can usually find a decent example of 1995P-1DO-001 in a spotty BU grade for around $15-$20. It's well worth the investment to be able to see the real thing in person.
Note too that Machine Doubling and doubled dies aren't mutually exclusive. It is possible for a coin struck from a doubled die to also be machine doubled.
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