In fact, the causes of software data loss are very complicated, each situation has specific symptoms, or multiple symptoms appear at the same time. Generally speaking, as long as the data area is not completely covered, individual users can basically recover smoothly through some specific software.
Physical failure:
Physical failure refers to the hardware damage of the hard disk itself, which makes the hard disk unable to operate normally and unable to identify or access data. Hard disk is generally composed of electronic/software/mechanical components such as circuit board, firmware, magnetic head, magnetic disk, motor, etc., and any component may fail.
1.PCBburned: The hard disk circuit board is burned, or the control chip on the hard disk circuit board is damaged. Because the hard disk circuit board uses programmable chips, the maintenance of the hard disk circuit board is not only the work of "soldering iron" and "soldering". You also need to use special programming equipment.
2. Firmware damage: Firmware is a hardware program that controls the normal operation of the hard disk and is the "brain" of the hard disk.