Symptoms can be conditionally divided into three groups according to the external manifestation of problem:
1) Hard drive is not recognized in BIOS;
2) Hard drive is recognized in BIOS, but is not accessible from operating system;
3) Operating system recognizes the disk, but when accessing data written on it, the system freezes or gives a fatal error message.
In case of any of the above problems further usage of HDD even after the repair is a huge risk to the information stored on it. It would be better to recover the data from it, copy it to another storage device and dispose of the faulty HDD. That’s it.