Samsung Electronics Co., Ltd.

Seagate Technology Incorporated

Institute for Information Technology Advancement

Dong-ho Oh

Yong-kyu Byun

Ja-Choon Koo

Jeong-seok Koh

Jae-hyuk Han

Cheol-soon Kim

Haeng-soo Lee

Kyung-ho Kim

Min-pyo Hong

Kwang-jo Jung

Sang-eun Baek

Woo-sung Kim

Ha-yong Kim

Jong-Youp Shim

Tae-yeon Hwang

Sung-joon Han

Nam-hoon Lee

A hard disk drive includes a housing including a base member and a cover member, a spindle motor disposed in the housing, a data storage disk disposed on the spindle motor, an actuator disposed in the housing to move a read/write head to a position on the data storage disk, a clock signal providing unit disposed on the data storage disk to provide a clock signal of the data storage disk, a position signal providing unit disposed on the actuator to provide a position signal of the actuator, and first and second windows disposed in the housing to correspond to the clock signal providing unit and the position signal providing unit.

Hard disk drive and servo track writing system for the same

A head stack assembly (HAS) of a hard disk drive (HDD) includes a swing arm, a connection plate integral with a terminal end of the swing arm, a head slider including a magnetic head for reading/writing data from/onto a disk, and a suspension that is attached to the connection plate, supports the head slider, and has characteristics which minimize the degree to which the magnetic head will run off-track due to vibrations induced in the HDD. The suspension includes two connecting parts having upper surfaces at which the suspension is attached to the connection plate. In the HDD, the upper surface of the connecting part positioned closest to the center of the disk center lies in a plane beneath the plane in which the upper surface of the other connecting part lies. Also, that half of the suspension which is disposed to one side of the central longitudinal axis of the HSA and is located remotely from the center of the disk in the HDD is stiffer than the other half of the suspension which is proximal the center of the disk. To this end, the suspension includes at least one side-rail that renders the suspension asymmetrical.

Head stack assembly with suspension supporting head slider and hard disc drive including the same

A fluid dynamic bearing is constructed to support stably a rotating body to which a non-uniform force is applied, and a hard disk drive (HDD) employing the fluid dynamic bearing is provided. The fluid dynamic bearing includes a journal bearing part supporting a rotary shaft in a radial direction of the rotary shaft, a thrust part formed at one end of the rotary shaft, a thrust bearing part facing the thrust part and supporting the rotary shaft in a longitudinal direction of the rotary shaft, and a plurality of grooves formed on a surface of the thrust bearing part and/or the thrust part. The plurality of grooves include a first groove group including a plurality of grooves having the same shape and arrangement, and a second groove group adjacent to the first groove group and including at least one groove asymmetric with respect to the grooves of the first groove group.

Fluid dynamic bearing and hard disk drive employing the same

Provided are a method of calculating repeatable runout (RRO) of a hard disk drive (HDD) in a frequency domain, a method of calculating a compensation value using the RRO calculating method, and recording media used therefore. The method of calculating RRO in a disk with a plurality of tracks includes: calculating first set of frequency coefficients for representing the RRO by analyzing a position error signal (PES), which is sampled in a target track, in a frequency domain while a head follows the target track; and calculating the RRO using the first set of frequency coefficients.

Methods calculating RRO and RRO compensation value in HDD

A disk holder for an off-line servo-track writer is installed at a driving motor of the off-line servo-track writer in a state in which a plurality of disks for information storage are assembled to the disk holder. The disk holder has a flange for supporting the plurality of disks, a mounting portion to be joined to the driving motor is provided at one side of the flange, and a hub is provided at the other side of the flange. A space into which air flows is formed in the hub, and the plurality of disks and a plurality of spacers for maintaining a gap between the plurality of disks are assembled around the outer circumference of the hub. A plurality of pressing members are installed at the hub to move back and forth in a radial direction of the hub.

Disk holder for off-line servo-track writer

A spindle motor, which rotates a plurality of data storage disks in a hard disk drive, the spindle motor including: a shaft; an inner hub rotatably installed on an outer periphery of the shaft; and a hub assembly, which includes: an outer hub detachably coupled to an outer periphery of the inner hub, the outer hub shaped such that a plurality of disks and at least one spacer for maintaining an interval between adjacent disks of the plurality of disks can be secured to an outer periphery of the outer hub; and a fastening member coupled to a top portion of the outer hub and fixing the outer hub to the inner hub. The outer hub assembly to which the plurality of disks are secured can be mounted on an off-line servo-track writer, and can also be attached as is to the spindle motor after servo-track writing is completed.

Outer hub assembly and spindle motor including the same in hard disk drive and method for servo-track writing

A disk drive having an anti-shock structure is provided. The disk drive includes: a base member; a spindle motor supported by a spindle motor support formed on the base member, the spindle motor rotating a data storage disk; an actuator rotatably coupled to an actuator pivot supported by a pivot support formed on the base member, the actuator moving a read/write head to a position on a recording surface of the disk; and slots formed in the base member around the circumference of each of the spindle motor support and the pivot support, the slots for partially controlling the stiffness of the base member. The slots include a first slot formed on a circumference region of the spindle motor support near the pivot support, and a second slot formed on a circumference region of the pivot support opposite to the spindle motor support. Due to the structure of the disk drive, the spindle motor and the actuator pivot are inclined in the same direction when an external impact is applied. Therefore, a collision between the head and the disk, i.e., a head slap, is unlikely to occur, thereby minimizing damage to the head and the disk caused by the head slap.

Disk drive having anti-shock structure

An actuator arm of an actuator assembly includes a 4-bar linkage structure defined by a trapezoidal shaped opening formed between a front end of the actuator arm and a pivot shaft. A first rounded extension portion and a second rounded extension portion are formed at two corners adjacent to the pivot shaft of the opening, respectively, and a third rounded extension portion is formed at two corners adjacent to a front end of the opening, and hinges H, H, Hand Hare formed at the actuator arm by the first, second and third extension portions. Design factors determining a shape of the opening are optimized to meet the following relations for the structure of the 4-bar linkage: W(cos &#x3b2;&#x2212;1)+Z(cos &#x3b1;&#x2212;1)=&#x3b4;=0, W sin &#x3b2;+Z sin &#x3b1;=&#x3b4;=0.

Actuator assembly having optimized 4-bar linkage type actuator arm, hard disk drive employing the same, and method for optimizing shape of opening formed in actuator arm

A head-gimbal assembly of a hard disk drive includes a loadbeam connected to a pivot arm, a slider on which a magnetic head is mounted, an elastic support member having one end coupled to the loadbeam and the other free end portion at which the slider is supported, and a damper provided between the loadbeam and the slider to attenuate vibration transferred between the loadbeam and the slider.

Growing community of inventors

Seoul, South Korea

Dong-ho Oh