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Inventor:
Jung; Kwang-jo
Address:
Suwon-si, KR
No. of patents:
13
Patents:












Patent Number Title Of Patent Date Issued
8035914 Hard disk drive and method for designing additional controller included in hard disk drive October 11, 2011
A hard disk drive is provided. The hard disk drive comprises a plant configured to drive the hard disk drive, a main controller configured to control the plant, and an additional controller connected in parallel with the main controller. A response function in consideration of the pl
8035908 Methods of forming and reading servo track and data storage apparatus October 11, 2011
A method of forming a servo track on a recording medium includes; forming a magnetic layer, defining a first servo track region having a plurality of first magnetic segments and a second servo track region having a second plurality of magnetic segments in the magnetic layer, applying a
8004787 Method and system for servo track write August 23, 2011
A servo track writing method and a servo track write system of a hard disk drive (HDD) using the servo track write method. The servo track writing method includes performing a reference check (R/C) on a first servo pattern which is pre-written on a first surface of a disk, and if the
7613587 Method for compensating for acceleration vector offset, recording medium storing program for exe November 3, 2009
Embodiments of the invention provide a method for compensating for an acceleration vector offset of an acceleration detector, a recording medium storing a program for executing the method, and an apparatus adapted to perform the method. The method comprises determining whether the ac
7531983 Method of controlling startup current of motor and disk drive using the method May 12, 2009
Provided is a method and apparatus for controlling a motor of a disk drive. The method is used to stably control the startup current of a motor by considering a voltage drop and the disk drive uses the method. The method includes managing power-on reset retry information generated du
7471480 Self servo writing method, hard disk drive using the same, and recording medium storing the meth December 30, 2008
Provided is a self servo writing method of writing a final servo signal based on a reference servo signal in a hard disk drive, and more particularly, a method of writing a uniform final self servo signal by compensating for a non-uniform width of tracks where a reference servo signa
7362538 Torque constant correction method in multiple sinusoidal seek servo and disk drive using the sam April 22, 2008
A disk drive control method and apparatus. In particular, a torque constant correction method and apparatus in a disk drive using a multiple sinusoidal seek servo scheme. The torque constant correction method includes: performing a test seek routine for torque constant correction by
7333286 Method of writing a reference servo signal of hard disk drive and apparatus suitable therefor February 19, 2008
In a method of writing a reference servo signal of a hard disk drive having a spiral reference servo signal that is referred to when writing a final servo signal is written while a head is moved across a disk for a predetermined time at a target movement velocity, an actual movement
7277250 Track zero determination method used in data storage system and disk drive using the same October 2, 2007
An optimal track zero determination method used in a hard disk drive and a hard disk drive using the method. The method has the operations: (a) performing a sequential seek operation on target tracks of a disk, in units of predetermined numbers of tracks, outwardly, from a track sepa
7145743 Apparatus and method for unlatching a head within a data storage device December 5, 2006
For unlatching a head within a data storage device, such as a HDD (hard disc drive), a VCM (voice coil motor) amplifier with a switch is used for applying at least one cycle of an acceleration current pulse to a voice coil motor (VCM) for unlatching the head during an acceleration time
7110205 Method for controlling start of adaptive spindle motor and disk drive using the method September 19, 2006
A method of controlling starting current of an adaptive spindle motor in consideration of maximum allowable consumption power and a disk drive using the method. The method includes measuring a supply voltage supplied to the disk drive, calculating a maximum current that can be supplied t
7057842 Method, medium, and apparatus for offline self servo writing and disk drive using the same June 6, 2006
An offline self servo writing method capable of improving servo writing accuracy and reducing copying time by designing a servo pattern of a reference disk to have the same resolution as a final servo pattern, and a disk drive using the method. The offline self servo writing method i
7016142 Apparatus and method for removing mechanical resonance using adaptive notch filter March 21, 2006
An apparatus and method for removing mechanical resonance in a disc drive using an adaptive notch filter. Mechanical resonance harmful to a system is removed by a notch filter that adaptively varies the frequency characteristics of the filter with respect to the mechanical resonance










 
 
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