Most likely, the motor and head circuitry survived. The burnt PCB can probably be cheaply replaced without cracking open the sealed internals of the drive mechanism, and the drive should work as normal after a test and calibration. Of course, wrong polarity will destroy SSDs and most other PC parts beyond the point of repair.
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I've absolutely fried a brand new HDD in my server because of this. I thought it was a cable for that PSU, but it was a different brand.
Most likely, the motor and head circuitry survived. The burnt PCB can probably be cheaply replaced without cracking open the sealed internals of the drive mechanism, and the drive should work as normal after a test and calibration. Of course, wrong polarity will destroy SSDs and most other PC parts beyond the point of repair.