My pen drive has bought 1 month ago . Pen drive brand SONY 32 GB. But suddenly my pen drive does not work. when I pen drive plug in PC then show your device installation but Pendrive not show. then I go to disk management then my usb flash device show NO Media. another way CMD open Diskpart --list disk --then enter but my device show (NO Media -o byte). Please how to solve this problem because I have a many important file .please give me a suggestion.