Fault type determination
Can recognize but cannot read: logical error, can be fixed by software; Knocking sound does not recognize the disk: Physical malfunction, power off immediately.
Software self rescue plan
CHKDSK checks and repairs bad lanes; Recuva/TestDisk recovery mistakenly deleted files; Do not write data to the faulty disk.
Professional data recovery
Physical failures must be sent to a professional dust-free system for recovery, which incurs high costs but has a high success rate. Regular backup of important data is the key.
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