| Also known as a read/write head arm, head arm or actuator arm, the access arm is similar to an arm on a record player and is found inside all computer hard disk drives. The access arm allows the hard drive to move the read/write heads to the locations where information needs to be read or written to. Below is a graphic example of the inside of a hard disk drive as well as an example of the access arm. 
Also see: Hard disk drive definitions, Voice coil
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