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This sounds like what happens on counterfeit Pen drives that only have 1 to 2 GB of real memory. The Pen drive memory controller has been reprogramed to display a larger memory size. It looks like it's writing the data but, in fact, it is discarding the excess data or wiring it to the last block. Sorry for the bad news.
Google the question - I did see one post with instructions for reformatting so you can use the 1 or 2 GB.