Description of the problem:
it is unavailable described structure of the disk file system is damaged. If the data is not important in peacetime, it can be directly formatted can use it. But sometimes there's data is important, then we must first restore the data re-formatting. Specific recovery methods can be seen to understand the text (not formatted recovery method) 
Tools / Software: Ultimate data recovery software
Step 1: Download and unzip the software after the first run, simply double-click the need to restore the partition. 
Step 2: Once the program finds the file, will be placed in the directory that you want to restore the disk of the same name in 
Step 3: Check the data will want to recover, and then save the upper right corner point, "save as" button to check out the file COPY. 
Step 4: The last step of the program data and the like need only copy is complete enough. 
Note 1: If you want to restore removable disk location is unavailable to note, you must first restore the data re-formatting.
Note 2: The location is unavailable recovered data temporarily saved to the other tray.