Below listing of the 7 fatal errors not to do when your hard disk is damaged.
1- In case of fire damage do not attempt to clean, or to place in refrigerator or freezer a fire damaged media.
2- In case of physical damage do not try to remove hard drive, do not shake, disassemble any hard disc or laptop that has been damaged , because improper handling can make recovery more difficult or impossible.
3- After physical damage immediately turn off computer, never attempt to operate any visibly damaged devices because further operation may damage data irremediably.