Marvell International Limited

Chiew Leong Wong

Zhimin Yuan

Chun Lian Ong

Pantelis Sophoclis Alexopoulos

Mengjun Liu

Ke Gan

Wuzhong Lin

Bo Liu

Li Wang

Siang Huei Leong

Weiya Xi

Khai Leong Yong

Jianzhong Shi

Kui Cai

Quan Jiang

Chao Bi

Kheong Sann Chan

Zhi Yong Ching

Qide Zhang

Budi Santoso

Pantelis Alexopoulos

Jing Zhang

Moulay Rachid Elidrissi

Guchang Han

Zhimin He

Jiang Feng Hu

Tiejun Zhou

Ming Chou Lin

Leonard Gonzaga

Stephen Ralph Viskochil

Wee Kiat Lim

Sufui Sophia Tan

Yansheng Ma

Shengkai Yu

Yin Quan Yu

Kannan Sundaravadivelu

Ningyu Liu

Jianqiang Mou

Boon Long Ibrahim See

Venkataramanan Venkatakrishnan

Cheng Peng Tan

Chong Wee Lee

Eng Teo Ong

Phyu Hla Nu

Wei Hua

Cheng Su Soh

An axial field motor and a method of assembling the motor are provided. The hard disk drive includes a spindle motor having a fluid dynamic bearing (FDB) motor hub, a hard disk drive housing and a base insert. The hard disk drive housing houses the spindle motor therewithin and has an upper housing and a base, the base including a first material. The base insert has ferromagnetic properties, includes a second material and has a flat circular bottom portion and an outer circumferential vertical portion. The flat circular bottom portion of the base insert is located between the FDB motor hub and the base to enhance yield strength therebetween and a bottom portion of the FDB motor hub is surrounded by the outer circumferential vertical portion of the base insert to generate preload for the FDB motor hub.

Hard disk drive spindle motor including a base and a base insert formed from different materials

A servo system for writing servo information on a recording medium of a hard disk drive and for determining head position based on the servo information with a tracking accuracy, the servo system including a first magnetic head and a servo writer. The servo writer is configured to write the servo information on the recording medium by forming, using the first magnetic head, a first servo pattern comprising a servo burst pattern on a segment of a first track of a first layer of the recording medium; and by forming a second servo pattern comprising addressing information on a segment of a second track of a second layer of the recording medium. The second track is arranged half a width of the first track from the first track to increase the tracking accuracy of the servo system.

Method and apparatus for writing servo information on a recording medium

According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Data storage device

In various embodiments, a method of writing servo information to a recording medium may be provided. The method include forming a first servo pattern (including a servo burst pattern) on a segment of a first track of a first layer of the recording medium, the first track having a track width. The method may further include forming a second servo pattern (including addressing information) on a segment of a second track of a second layer of the recording medium. The second track is arranged from the first track by half the track width.

Recording medium and a method of writing servo information on the same

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Singapore, Singapore

Chiew Leong Wong