Hard disk drive (HDD) coils, also known as voice coil motors (VCMs), are an important part of a hard disk drive and control the movement of the read/write head assembly. The main purpose of the HDD drive spool is to precisely position the read/write heads on the desired magnetic tracks of the rotating disk platters.


A hard disk drive spool consists of a wire wrapped around a spool or spool holder. The wire used is usually insulated copper to ensure efficient current flow and low resistance.

The design of a hard disk drive coil includes considerations such as the number of windings, wire gauge, and coil geometry. These factors determine the electrical and mechanical properties of the coil.

The hard disk drive coil is part of the hard disk drive actuator assembly. It is responsible for moving the read/write heads across the disk platters to access the desired data tracks.

The hard disk drive coil works on the principle of electromagnetic force. When an electric current passes through the coil, a magnetic field is generated and interacts with the actuator's permanent magnets, causing linear motion of the coil. This motion allows for precise positioning of the read/write heads.

The movement of the hard disk drive coil is controlled by a closed-loop system that uses positional feedback from sensors to precisely position the read/write heads on the data tracks. This feedback allows the hard disk drive controller to adjust the current flowing through the coil and maintain precise positioning.

The hard drive spool is designed to ensure precise, rapid movement of the read/write head assembly, which is critical for accessing and writing data to the disk platters. The performance and reliability of the hard disk spool is a critical factor in the overall performance of the hard disk drive. Hard Disk Drive Performance.