I tried formatting a 4GB USB drive (that had a Zorin OS Lite ISO flashed to it) in the Command Prompt in Windows. Originally, it gave me an "Access is denied" error when I would select and try to clean it in Diskpart. Now when I try to clean it, it tells me that the drive is not accessible anymore because of an I/O device error. I don't have anything valuable on this USB. I would like to be able to access it again if possible. It has been through a lot of reading/writing actions in the past couple of days.