Some helpful examples of physical recovery procedures include removing a damaged PCB (printed circuit board) and replacing it with a matching PCB from a healthy drive. Other good examples comprise changing the original damaged read/write head assembly with matching parts from a healthy drive, removing the hard disk platters from the original damaged drive and installing them into a drive that works fine. As these procedures are technical in nature, it is best that these are taken care of by professionals and not by untrained persons.
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