Hi guys. I have this 2TB Toshiba hard drive, USB only. I connected it and is not showing up on the desktop. The light keeps blinking. It appears in the Disk Utility but does not want to mount. I assume the directory is messed up and I have to rebuild it. What app can do that nowadays? Last time I did it was like 10 years ago. Thank you. BTW, the HD is not making any strange noises so I assume is the directory.