Problem description:
The disc in the drive is not formatted, indicating that the file system structure of the disc is damaged. Open the USB flash drive and prompt you need to format the specific recovery method, you can see the text to understand (recovery method without formatting) 
Tool/software: Extreme Data Recovery Software
Step 1: After Baidu search and download the software to open, directly double-click the partition to be restored. 
Step 2: The program will quickly put the scanned file in the same directory as the volume label of the disk to be restored. 
Step 3: Check the data to be restored, and then click Save in the upper right corner, "Save As" button to copy the checked files. 
Step 4: The last step is to wait for the program to copy the data. 
Note 1: The data recovered from the unformatted disc in the drive needs to be temporarily saved to other discs.
Note 2: If you want to restore the unformatted disc in the removable disk drive, you need to pay attention, you must first restore the data and then format it.