WD Caviar Black 2 TB

2009WD Caviar Black 2 TB

Two stage actuation enables higher track pitch

Why it's important
A two stage actuator separates the track to track motion into a coarse postioner and a fine positioner thereby lowering the mass of the fine positioniong mechanism which allows higher track pitch and thereby higher areal density.

In 1983 Drivetec shipped a flexible media disk drive using a dual stage stepper/stepper design that read conventional and high tpi FDs (it used a coarse stepper driving a cantilevered beam carrying the second fine stepper positioning the head over the track.).

First commercialization in HDDs announced as WD Caviar Black 2 TB ((model WD2001FASS) and WD RE4 2 TB (model WD2003FYYS)

HGST announced a similar structure in 2013

Additional Information
WD Dual Stage Actuator, annimation at UTube
"Dual-Stage Actuator White Paper," HGST, October 2013

Moderator:Tom Gardner

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