Western Digital Corporation

James K Benning

Martin John McCaslin

Michael J Kennedy

John M Tillson

David J Edwards

Mark G Dube

A servo track writer for a head disk assembly and a method of making the head disk assembly using the servo track writer are disclosed. The head disk assembly includes an enclosure having an opening and a base and an actuator arm coupled to the base and having a servo writer positioning arm facing surface. The servo track writer includes a platform for supporting the head disk assembly. The platform includes a base portion, a column extending substantially perpendicular to the base portion, and an elongated servo writer positioning arm for protruding through the opening and supported by the column. The positioning arm includes a main body, a tip having an actuator arm facing surface for abutting the positioning arm facing surface, and a vibration damper positioned between the main body and the tip. The vibration damper damps vibrations induced in the actuator arm by dissipating energy transferred between the platform and the actuator arm.

Servo track writer having a servo writer positioning arm with a

An automatic test system for both production and trouble shooting evaluation of various computer peripheral controller devices. The automatic test system includes a central processing unit, a receiver card adapted to receive a particular type of peripheral controller-under-test and a peripheral emulator. The automatic test system may be employed in the testing of a wide range of peripheral controller devices by utilizing differing receiver cards adapted to each specific kind of peripheral under test. In operation command and data signals are sent from the processor to the controller-under-test through the receiver card, causing the controller-under-test to send modified command and data signals to the peripheral emulator. The central processor then accesses memory in the peripheral emulator to ascertain if the controller-under-test sent the proper commands and data. Testing is further carried out by the central processor loading both normal and abnormal data and status signals into the peripheral emulator and subsequently instructing the unit-under-test to extract the data from the emulator and submit it to the central processor.

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Mission Viejo, CA, United States of America

James K Benning