An interesting case as well. The user reported that the disk would start spinning with several rhythmic clicks and then stop. The computer did not detect it, and the BIOS did not recognize the disk. The initial suspicion was a failure in the read-write head assembly.
During a thorough diagnostic, it was found that one of the motor windings had burned out, causing the disk to fail to reach 7000 RPM and preventing proper read-write operations. The read heads could not position over the platter surfaces because the air cushion did not form, which in turn released the head actuator locks.
This disk is very familiar to us. Therefore, the repair was straightforward: removing the actuator lock and reading the data with specialized equipment.