Samsung Electronics Co., Ltd.

Joe Bragg

Gregory Tran

Seong Hoon Kim

Seong Woo Kang

Vincent Nguyen

Nikollay Ivanov

Linh Nguyen

Kwong Tat Chan

Sooyoul Hong

Bipinchandra V Gami

Nikolay Ivanov

Scott Tran

Scott Tam

A servo writer that writes servo information onto a disk of a hard disk drive. The writing of the servo can be synchronized by a clock track that contains a clock read back signal. The clock read back signal is differentiated by a differentiator circuit. A clamping circuit clamps the clock read back signal to minimize signal ringing, undershoot and overshoot phenomena in the signal.

Apparatus and method to minimize amplitude variations associated with media/head response characteristics in servo writing of perpendicular magnetic recording

A method for writing servo information onto a disk of a hard disk drive with a servo writer. The disk has a circumferential index and a band of servo reference tracks. The circumferential index is detected from a clock signal generated from a clock track of the disk. The reference tracks include radial indices. A spiral servo pattern is written upon the detection of the circumferential index and a radial index. The servo writer includes a phase detector that detects changes in the relative position of the circumferential and radial indices and a delay circuit that delays the clock signal to offset such changes.

Delay clock track read back data to compensate time variance due to disk thermal expansion in spiral servo track writing

Aerodynamic forces contribute to disk and actuator vibration leading to track positioning errors in storage devices such as hard disk drives. The invention provides a variety of dampening mechanisms and a method of dampening to alleviate these problems in single disk storage devices. This includes disk drives of at most 13 millimeters in height.

Media enclosures dampening desk vibration in single disk storage devices

Aerodynamic forces contribute to disk and actuator vibration leading to track positioning errors in storage devices such as hard disk drives. The invention provides a variety of dampening mechanisms and a method of dampening to alleviate these problems.

Apparatus and method for dampening disk vibration in storage devices

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San Jose, CA, United States of America

Joe Bragg