how to fix "No media....; there is no disk in this drive" Sandisk extreme 64Gb CZ80

hi, im newbie, i bought this usb one years ago; and after unplug from a PC; my USB cant use anymore. I try to format, fix “No media…” by cmd but no work. So how to fix this error ???

Try the drive in a different USB port.  Try the drive in a different pc. 

If it shows do a Command Prompt CHKDSK command on it.

If it doesn’t show check SanDisk’s RMA page,