Spindle Motor
1. Spindle Motor Definition
A spindle motor is a small, high-precision, high-reliability electric motor that is used to
rotate the shaft, or spindle, on which the platters are mounted in a hard disk drive (HDD).
A platter is a thin, high-precision aluminum or glass disk that is coated on both sides with
a high precision magnetic material and which is used in a HDD to store data. Modern HDDs
typically contain multiple platters, all of which are mounted on a single shaft, in order to
maximize the data storage surface in a given volume of space