I am trying to migrate/clone from my 750GB HDD to a 500 GB 850 EVO SSD.I have cleared all the unwanted files and my HDD currently has about 300GB of data spread across three partitions.When I open up Samsung migration tool, it shows that the C drive is way bigger than what windows explorer shows. Plus, in the tool, if you add all the partitions it's going more than the physical HDD capacity.
Here are the actual sizes
Here are the actual sizes