Head Arm Alignment for Direct Access Storage Devices
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15
Currently most direct access storage device (DASD) designs rely on a datum stop or mechanical fixture to align head and suspension to an arm. A datum feature is then used to align arm to arm to actuator spindle (if rotary) or actuator head slider (if linear). A method to eliminate the need for datum stops in between arms and which aligns the heads more accurately is described. The technique uses the electromagnetic head throat width to inter-align heads by using simple servo control methods. Manufacturing problems found in assembly and the cost of manufacturing highly accurate, machined parts are also reduced. The need for an improved technique for aligning heads becomes necessary as track widths are reduced.