Typically, the sign of a seized motor bearing is a repetitive buzzing every 1 -2 seconds and this is caused by the motor trying to spin up and failing. This type of failure is generally caused by a trauma such as the drive being knocked over or dropped whilst the motor is running at full speed. As well as head stack replacements, another relatively common type of hard drive mechanical failure that we deal with at EADR is seized spindle motor bearings.
