Thanks. I have tried Diskpart. When I select my desired part is shows "No media". So, I can not clean or partition it. I also tried list volume but it is not there. But I am not sure if the drive is dead. When I insert it to the usb port I am hearing a beep sound. It sounds again when I remove this. So, I think the drive is still alive. Anyway, I am checking with Lexar if I find anything.