Another Seagate 7200.12 ST31000524AS patient hdd has been fixed from the same Dolphin user in Greece with very similar symptom, busy and undetected failure.
Users can read the post Seagate ST31000528AS HDD Data Recovery Steps here to learn how to fix this kind of failure.
HDD Model: st31000524as
PCB Number: 100574451 revb
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ST500DM002-1BD142 HDD Data Recovery Steps