Customer description：
The customer told us the hard drive could be recognized, but the data inside could not be read at all, and it was found that part of the data was missing.
Inspection results
The magnetic head of the hard drive was damaged.
There were bad tracks in the disk.
Recovery process:
Since the magnetic head was damaged, the disk should be treated in the dust-free room.
Analyzed and collected undamaged disk sectors.
Repaired the restored MDF files.
