Access arm

Updated: 10/18/2022 by Computer Hope

Alternatively called the read/write head arm, head arm, or actuator arm, the access arm is in every mechanical hard drive with a similar to the arm of a record player. As the platter spins, the access arm adjusts along the axis point to move the read/write heads to read, write, or delete information. The image shows the inside of a hard drive with the actuator and actuator arm.

Inside a computer hard disk drive


The actuator and actuator arm are only found in mechanical hard drives. SSDs and NVMes don't have any mechanical parts.

Hard drive terms, Voice coil