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actuator
Last modified: Thursday, October 19, 2006 

The part of a hard disk to which the read/write arms attaches. All the heads are attached to a single head actuator, also called an actuator arm, that moves the heads around the platters.  Older hard drives used a stepper motor actuator, which moved the heads based on a motor reacting to stepper pulses. Modern hard drives use a voice coil actuator, which controls the movement of a coil toward or away from a permanent magnet based on the amount of current flowing through it. This guidance system is called a servo.

See also Webopedia's "Did You Know... What's Inside a Hard Drive?"

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Actuators - Broad-line distributor web site features real-time stock status and pricing, online ordering, RFQ, technical support, product datasheets and photos.

Actuator - Manufactures electric, hydraulic, rotary, and linear actuators.

NSK Precision America: Actuators - Manufactures precision motion control products, including ball screws, linear guides and actuators, motors, robot modules, and X-Y stages.


For internet.com pages about actuator . Also check out the following links!

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HardwareCentral
Resource site offering news and information about PC hardware elements. Includes timely feature articles and sections on optimization and troubleshooting.

Sponsored listings

Actuators - Provider of automated and manual valves. Categories include ball, butterfly, plug and integral (valve/actuator), as well as accessories.

Actuators - Industrial product directory allows users to send RFQs, view catalogs and compare suppliers. Find suppliers of Actuators.

Schneeberger: Actuators - Designs and manufactures linear guide technology products used with a variety of industrial equipment and machinery.

Techna-Tool: Actuators - Supplies reliable tool monitoring systems to high production metal cutting manufacturers, including monitoring of actuators.

GlobalSpec.com: Actuators - Database of suppliers for linear actuators, piezoelectric actuators, rotary actuators and valve actuators. Provides catalogs and contact info.

related categories

Hard Disk Drives

related terms

cylinder

cylinder zero

hard disk

hard disk drive

hard disk type

head

physical drive

platter

read/write head

spindle


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