I recently purchased a "4gb" nano clone from ebay. I extensively read all of the warnings and reviews about the clones and decided to go ahead and risk it anyway...

When I received it windows said "4.08gb" and after several of the data files that I added to it went crazy (with them containing countless 0kb files in Jap. characters which I couldn't delete), I reformatted and the filesize slightly went down to 3.98gb. And according to windows, I've used about 2.63gbs of space.

And after reading about the elusive 4gb nano clone myth, I can only assume that my player, like all of the others, is hacked.

Now, my question is, how do I know for sure?