Seagate Technology Incorporated

Magnetic Peripherals Inc.

Gary D Sorenson

Thomas J Schmitt

Robert Allen Janssen

James H McGlennen

John S Putnam

Klaus Obergfell

A disc drive storage system and device is provided in which uncharacteristic behavior of a signal source caused by having to drive a very low impedance due a common mode component of the drive signal is eliminated. A write head that has a first and second end writes on a disc surface. A signal source provides a drive signal to the write head. The drive signal has a differential signal component and a common mode signal component. An electrical interconnect path couples the write head and the signal source. The electrical interconnect path provides a return path for the differential signal component and an open circuit for the common mode signal component. A common mode termination network with a first node, second node and a center tap is included. The first node is connected to the first end of the write head, the second node connected to the second end of the write head and the center tap connected to ground to provide a return path for the common mode signal component. In addition, a method of providing a return path for a common mode signal in a disc drive storage system is provided.

Common mode termination method and apparatus for a write head

A disc stabilizer for use in a spin-stand tester having a spindle motor for rotating a disc is provided. The spin-stand tester is capable of positioning a transducing head adjacent a first surface of the disc. The disc stabilizer includes a vacuum plate coupled to a spindle of the spindle motor. The vacuum plate has a top surface and a bottom surface opposite the top surface. At least one of the top and the bottom surfaces is a grooved surface including multiple vacuum channels. The grooved surface is substantially in contact with a second surface of the disc. Vacuum distributed through the multiple vacuum channels of the grooved surface is applied directly to the second surface of the disc, thereby holding the disc in place.

Vacuum plate disc stabilizer for a spin-stand tester used for testing a head-gimbal assembly

A retractable grounding device for a spindle motor having a rotor shaft is provided. The retractable grounding device includes a grounding connector configured to connect the rotor shaft to ground and a position adjuster coupled to the grounding connector. The position adjuster moves the grounding connector between a first position where the grounding connector is in contact with the rotor shaft and a second position where the grounding connector is retracted from the rotor shaft. In addition, a method of selectively grounding a rotor shaft of a spindle motor is provided.

Retractable grounding device for a spindle motor

A process for chemically bonding a lubricant to a magnetic disk by applying a functionalized polymeric lubricant to the disk, heating it until a significant portion bonds to the disk via the functional terminal group, and then reacting the unbonded residue with a chemical moiety, the residue then forming a mobile lubricant highly resistant to spin-off due to the presence of the bonded lubricant.

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Eden Prairie, MN, United States of America

Gary D Sorenson