Marvell International Limited

Agency for Science, Technology and Research

Budi Santoso

Zhimin Yuan

Siang Huei Leong

Chun Lian Ong

Pantelis Sophoclis Alexopoulos

Jingliang Zhang

Bo Liu

Li Wang

Weiya Xi

Khai Leong Yong

Jianzhong Shi

Kui Cai

Quan Jiang

Kheong Sann Chan

Chao Bi

Zhi Yong Ching

Qide Zhang

Jing Zhang

Moulay Rachid Elidrissi

Chiew Leong Wong

Zhimin He

Guchang Han

Shiming Ang

Mengjun Liu

Kaidong Ye

Tiejun Zhou

Jiang Feng Hu

Leonard Gonzaga

Ke Gan

Wuzhong Lin

Wee Kiat Lim

Sufui Sophia Tan

Yansheng Ma

Yin Quan Yu

Kannan Sundaravadivelu

Ningyu Liu

Jianqiang Mou

Boon Long Ibrahim See

Venkataramanan Venkatakrishnan

Joo Boon Marcus Travis Lim

Cheng Peng Tan

Chong Wee Lee

Phyu Hla Nu

Wei Hua

Cheng Su Soh

Shengkai Yu

A hard disk drive device and a method and apparatus for control of the hard disk drive is provided. The hard disk drive includes disk media, a slider head, a head gimbal assembly and a control means. The disk media includes at least two layers for data storage. The slider head flies above the disk media and includes a writer and a reader, and a head gimbal assembly supports the slider head above the disk media. The control means is physically coupled to the head gimbal assembly and electrically coupled to the writer and the reader for reducing write interference from the writer when the writer is writing to the disk media while the reader is reading from the disk media, wherein write interference is reduced in one or more of a time domain and a frequency domain.

Write interference reduction when reading while writing to a hard disk drive media

A system including a write head, a read head, a mixer, and a filter. The write head is configured to write a pattern on a track of a medium of a hard disk drive, wherein the pattern has a first frequency. The read head is configured to read the pattern written on the track of the medium of the hard disk drive. The mixer is configured to mix a first signal generated by reading the pattern with a second signal to obtain a mixed signal. The second signal has a second frequency, and wherein the second frequency is different than the first frequency. The filter is configured to filter the mixed signal to determine a relative head-to-disk speed. The filter has a parameter selected based on a difference between the first frequency and the second frequency.

Method and apparatus for determining relative head-to-disk speed

In the present disclosure, a recording medium and a method of preparing a recording medium is provided. In a recording medium, a first annular servo track can be provided on a first layer of the recording medium, and second annular servo track can be provided on the first layer of the recording medium. The second annular servo track can be adjacent to the first annular servo track. In the recording medium, the first annular servo track and the second annular servo track are magnetically polarized and are magnetically opposing in polarity. A corresponding method of preparing a recording medium is provided.

Recording medium, a data storage apparatus and a method of preparing 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

Methods and architecture for monitoring hard disk drive operation is provided. The hard disk drive system provided includes a spindle, a head and a disk with a disk medium including a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track. The method includes the steps of writing a wide track pattern having a predetermined frequency on a track of a hard disk drive medium, generating a readback signal by reading the pattern from the track, processing the readback signal by mixing the readback signal with a reference signal to obtain a mixed signal having a summed signal and a difference signal, and filtering the mixed signal by a filter centered around the difference signal to generate a measurement signal corresponding to a relative speed change of the spindle and a head-to-disk motion. In addition, filtering a readback signal generated by the head when positioned at the middle of the first track and the second track with a first filter centered at the first frequency and a second filter centered at the second frequency is used to generate signals for determining spindle speed variation, spindle speed jitter, and relative head-disk vibration in the downtrack direction, for synchronizing writing in Two Dimensional Magnetic Recording (TDMR) and for measuring continuous flying height information based on Wallace equations.

Methods and apparatus for hard disk drive system operation monitoring and self-adjustment

A magnetic media tester comprising a Laser Doppler Vibrometer (LDV) head; and a magnetic read head; the LDV head and the magnetic read head being configured for obtaining correlatable data of a region on a magnetic disk.

Magnetic media tester and a method of magnetic media testing

Growing community of inventors

Singapore, Singapore

Budi Santoso