Abstract: Provided is a training method capable of reducing or minimizing a training time. The training method includes, for each of devices to be tested, calculating a first eye width at which a first signal and a second signal synchronize with each other at a first operation speed, and calculating a second eye width at which the first signal and the second signal synchronize with each other at a second operation speed different from the first operation speed; performing machine learning on the first eye width and the second eye width to derive a model showing a relation between operation speeds and eye widths; and calculating a third eye width corresponding to a third operation speed different from the first operation speed and the second operation speed, using the model.

Abstract: The present invention relates to a use of D-chiro-inositol, pinitol, or analog compounds thereof for preventing or treating female menopausal symptoms. The active ingredient compound of the present invention has an effect of increasing the activity of female hormones by increasing the blood concentration of 17?-estradiol and lowering the blood concentration of sex hormone-binding globulin. Therefore, the active ingredient compound of the present invention can be developed as a drug or a nutraceutical for preventing, alleviating or treating female menopausal symptoms. The active ingredient of the present invention is derived from a natural product, and thus, unlike an agonist of female sex hormones or chemically synthesized sex hormones, has very few side effects when applied to the human body.

Abstract: The present invention relates to a use of pinitol, D-chiro-inositol or an analog thereof in preventing, alleviating or treating premenstrual syndrome. According to the present disclosure, pinitol, D-chiro-inositol, or an analog thereof can be developed into a drug or a nutraceutical for prevention, alleviation, or treatment of premenstrual syndrome thanks to the alleviative effect thereof on the main symptoms of premenstrual syndrome inclusive of dysmenorrhea, a period of dysmenorrhea, and coldness of hands and feet, and may elicit few side effects when applied to the human body because they are derived from natural products.

Abstract: The present invention relates to a use of D-chiro-inositol, pinitol, or analog compounds thereof for preventing or treating female menopausal symptoms. The active ingredient compound of the present invention has an effect of increasing the activity of female hormones by increasing the blood concentration of 17?-estradiol and lowering the blood concentration of sex hormone-binding globulin. Therefore, the active ingredient compound of the present invention can be developed as a drug or a nutraceutical for preventing, alleviating or treating female menopausal symptoms. The active ingredient of the present invention is derived from a natural product, and thus, unlike an agonist of female sex hormones or chemically synthesized sex hormones, has very few side effects when applied to the human body.

Abstract: A hard disk drive includes a disk pack having at least one disk for recording and/or storing data and a spindle motor that support and rotates the disk, a base to which the disk pack is mounted, a cover that covers an upper surface of the base, and a respective filter disposed close to each of at least one of the major surfaces of the disk and extending in the radial direction of the disk including over at least an inner peripheral region of the disk. The filter has an absorbent layer capable of absorbing particles that come in contact with it. Particles on the surface of the disk, from the inner to the outer peripheral regions of the disk, are removed by the filter when the disk is rotated and the particles are flung off of the disk. Thus, particles will not damage the magnetic head(s) of the hard disk drive nor will the particles cause errors to occur in the recording and/or reproducing of data.

Abstract: An actuator assembly usable un a hard disk drive includes an actuator arm having an arm hole to improve dynamic characteristics. The actuator arm of the actuator assembly has an arm hole having first, second, and third extended portions, and two members positioned at both sides of the arm hole. The first extended portion is formed at an edge positioned at a leading end of the arm hole so that each of leading ends of the two members has a first reduced width, the second extended portions are formed at edges positioned at a rear end of the arm hole so that each of rear ends of the two members has a second reduced width, and the third extended portions are formed at both sides of a middle portion of the arm hole so that each of middle portions of the two members has a third reduced width.

Abstract: An arm plate coupled to a pivot bearing to closely contact an overmold and having a leading end portion where a head gimbal assembly (HGA) is attached when assembling a head stack assembly (HSA) of a hard disk drive (HDD), wherein a bending alleviation through hole is formed in a portion that overlaps and closely contacts an edge of the overmold, the head stack assembly with the arm plate, and the hard disk drive with the head stack assembly.

Abstract: A hard disk drive (HDD) having a spindle motor, at least one data storage disk, a disk clamp fastened to the spindle motor and fixing the disk to the spindle motor, and at least one disk spacer mounted on the spindle motor to support the disk. The disk spacer includes a ring-shaped disk spacer body fitted around an outer circumference of the spindle motor with at least one surface contacting the disk, a first groove on the surface of the spacer body contacting the disk, a second groove on the surface of the spacer body contacting the disk to extend along both sides of the first groove, and a damping member between the spacer body and the disk to reduce vibrations of the disk, seated in the first groove in a normal state and compressed by the disk, a portion of which is deformed and accommodated in the second groove.

Abstract: A hard disk drive includes a disk pack having at least one disk for recording and/or storing data and a spindle motor that support and rotates the disk, a base to which the disk pack is mounted, a cover that covers an upper surface of the base, and a respective filter disposed close to each of at least one of the major surfaces of the disk and extending in the radial direction of the disk including over at least an inner peripheral region of the disk. The filter has an absorbent layer capable of absorbing particles that come in contact with it. Particles on the surface of the disk, from the inner to the outer peripheral regions of the disk, are removed by the filter when the disk is rotated and the particles are flung off of the disk. Thus, particles will not damage the magnetic head(s) of the hard disk drive nor will the particles cause errors to occur in the recording and/or reproducing of data.

Abstract: An actuator assembly usable un a hard disk drive includes an actuator arm having an arm hole to improve dynamic characteristics. The actuator arm of the actuator assembly has an arm hole having first, second, and third extended portions, and two members positioned at both sides of the arm hole. The first extended portion is formed at an edge positioned at a leading end of the arm hole so that each of leading ends of the two members has a first reduced width, the second extended portions are formed at edges positioned at a rear end of the arm hole so that each of rear ends of the two members has a second reduced width, and the third extended portions are formed at both sides of a middle portion of the arm hole so that each of middle portions of the two members has a third reduced width.

Abstract: A hard disk drive (HDD) having a spindle motor, at least one data storage disk, a disk clamp fastened to the spindle motor and fixing the disk to the spindle motor, and at least one disk spacer mounted on the spindle motor to support the disk. The disk spacer includes a ring-shaped disk spacer body fitted around an outer circumference of the spindle motor with at least one surface contacting the disk, a first groove on the surface of the spacer body contacting the disk, a second groove on the surface of the spacer body contacting the disk to extend along both sides of the first groove, and a damping member between the spacer body and the disk to reduce vibrations of the disk, seated in the first groove in a normal state and compressed by the disk, a portion of which is deformed and accommodated in the second groove.

Abstract: A hard disk drive with a housing having a base plate and a cover plate. A spindle motor is installed on the base plate. A disk is installed on the spindle motor to store data. An actuator has a magnetic head to record and reproduce data on the disk, is installed on the base plate, and is pivoted by a voice coil motor. A printed circuit board is installed on a bottom surface of the base plate. A through hole, where servo track information is recorded on a recording surface of the disk, is positioned in the base plate, and a hole cover made of a metal plate exhibiting an electric conductivity and covering the through hole, is attached to the bottom surface of the base plate to block an electromagnetic wave generated by the printed circuit board from being transferred to the inside of the housing.

Abstract: A disk clamp of a hard disk drive to affix a magnetic disk that stores data to a spindle motor of the hard disk drive includes a pressing portion formed along an outer circumference of the disk clamp at an edge portion, to press an upper surface of the disk in a vertical direction, a stress distribution portion formed inside the pressing portion and having a profile with a curved shape bulged upward to distribute stress applied to the disk, and a plurality of screw coupling holes into which screws are inserted to be coupled to an upper end portion of the spindle motor and provided at a predetermined distance in a circumferential direction inside the stress distribution portion. Thus, since the stress applied to the disk is uniformly distributed in the circumferential direction of the disk by the stress distribution portion, flatness of the disk is improved.

Abstract: A disk drive recording device comprises at least two platters for storing magnetic recording data and a spindle motor rotating at high speed for mounting the platters. The disk drive is assembled by using pushing devices to push the platters toward the center of the spindle motor in respective directions to bring a portion of an inside circumference of a concentric center hole of each of the platters in contact with an outer circumference of the spindle motor so that the center of gravity of each platter coincides with a center axis of the spindle motor.

Abstract: A disk drive recording device comprises at least two platters for storing magnetic recording data and a spindle motor rotating at high speed for mounting the platters. The disk drive is assembled by using pushing devices to push the platters toward the center of the spindle motor in respective directions to bring a portion of an inside circumference of a concentric center hole of each of the platters in contact with an outer circumference of the spindle motor so that the center of gravity of each platter coincides with a center axis of the spindle motor.

Abstract: The present invention relates to a supporting device for minimizing physical shocks, vibrations and noise of a hard disk drive and more particularly to a hard disk drive in which a supporting device having a damper is installed to protect data recorded on a disk from being lost and to protect the disk or the head from being damaged due to the physical shocks, vibrations and noise. A supporting device for minimizing the physical shocks, vibrations and noise in a hard disk drive having a disk rotating at high speed by the driving of a spindle motor, and a head assembly including an actuator and a magnetic head for writing and reading data recorded in the individual tracks of the disk, and a plate having a substantially same thermal expansion coefficient as that of a base body fixed to the shaft of the spindle motor, a pivot supporting the head assembly, and a damper attached to an upper portion of the plate, for damping the physical shocks, vibrations and noise.