Last time my USB could not be opened, whenever I wanted to open it, it asked me to format first, but I needed the information in it.
SO I searched the method to recover it, and I found the excellent program.
the important thing is, when USB or external hard disk, partition become dead or unresponse, do not format it.
Here how to use the said program:
plug your dead USB into PC, and run this program, then it will display all hard drivers in your PC, but the names of those hard drivers are not displayed, so you can know the dead one by noticing its size.
When you know dead USB..., just click on it.
The frst, you use the fast format recovery. If it does not work, use the next method. Usually, the first method is working.