USB sony Vaio
I have a sony vaio 500GB flash disk my windows know not the flash
There is no such thing as a genuine 512GB Sony Vaio USB flash drive - it's a fake. http://flashdrivefacts.wordpress.com/2009/03/26/sony-microvault-genuine-usb-flash-drives-archive-of-retired-models-to-avoid-fakes-and-counterfeits/
They are being sold on Ebay and you have fallen victim to the fraud. I just hope you didn't pay a lot of money for it because it's useless.