If you have purchased a ' fake' flash drive (one that has been 'clocked' so it reports a larger capacity than it actually is), then although a factory utility described below may appear to fix it and correct it so that it reports it's true capacity, it will probably fail at some time in the future, as these devices often contain defective memory chips which failed the manufacturers tests and were sold off as defective 'reduced capacity' Grade C stock (or just pinched from the dustbins behind the factory!).
