Patents by Inventor Jae-deog Cho
Jae-deog Cho has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8023379Abstract: Provided are a disk defect inspection method and apparatus. The defect inspection method includes; determining an independent recording density value for disk defect detection in relation to disk drive component factors excepting a disk of the disk drive, and performing a disk defect inspection using the independent recording density value for disk defect detection.Type: GrantFiled: April 3, 2009Date of Patent: September 20, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Seung-youl Jeong, Se-hyun Kim, Jae-deog Cho
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Publication number: 20110194205Abstract: A method of managing defects of a recording medium of a data storage device includes performing a quality test related to occurrence of errors for each data sector in the recording medium; classifying a quality of each data sector according to evaluation criteria corresponding to quality classifications based on the quality test; determining a number of data sectors in each quality classification; and defect-processing the data sectors of the quality classifications that range from a lowest quality classification to a highest quality classification within a defect management limitation of the data storage device.Type: ApplicationFiled: February 10, 2011Publication date: August 11, 2011Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hwa-jun Kim, Jae-deog Cho
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Patent number: 7978428Abstract: A disk drive includes a disk having a track that includes a data sector divided by a servo sector so that a first data sector portion is on a first side of the servo sector, and a second data sector portion is on a second side of the servo sector. The disk drive reads data by: positioning the head at a first offset position with respect to the track and reading data from the data sector. When a read error occurs between the first and second data sector portions, the disk drive: stores the data from the first data sector portion in memory, moves the head to a second offset position with respect to the track, reads data from the second data sector portion with the head at the second offset position, and stores the data read from the second data sector portion in the memory.Type: GrantFiled: January 23, 2009Date of Patent: July 12, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Jae Deog Cho, Seung Youl Jeong
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Publication number: 20090252012Abstract: Provided are a disk defect inspection method and apparatus. The defect inspection method includes; determining an independent recording density value for disk defect detection in relation to disk drive component factors excepting a disk of the disk drive, and performing a disk defect inspection using the independent recording density value for disk defect detection.Type: ApplicationFiled: April 3, 2009Publication date: October 8, 2009Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Seung-youl JEONG, Se-hyun KIM, Jae-deog CHO
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Publication number: 20090190246Abstract: A disk drive includes a disk having a track that includes a data sector divided by a servo sector so that a first data sector portion is on a first side of the servo sector, and a second data sector portion is on a second side of the servo sector. The disk drive reads data by: positioning the head at a first offset position with respect to the track and reading data from the data sector. When a read error occurs between the first and second data sector portions, the disk drive: stores the data from the first data sector portion in memory, moves the head to a second offset position with respect to the track, reads data from the second data sector portion with the head at the second offset position, and stores the data read from the second data sector portion in the memory.Type: ApplicationFiled: January 23, 2009Publication date: July 30, 2009Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jae Deog CHO, Seung Youl JEONG
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Patent number: 7499237Abstract: A method of controlling recording and a hard disk drive (HDD) using the same. The HDD has heads in which a write head and a read head are spaced apart from each other by a predetermined gap in a track direction, and the method includes: reading a table having a head gap time corresponding to the gap between the write head and the read head and a disk linear velocity; and beginning a write operation by delaying the write operation by the head gap time from a data sector pulse. Accordingly, since a gap between a servo sector and a data sector and between data sectors can be reduced by the length corresponding to a head gap time, the usage efficiency of a data area can be increased.Type: GrantFiled: July 7, 2006Date of Patent: March 3, 2009Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-deog Cho
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Patent number: 7440211Abstract: Provided is a method and apparatus for adaptively controlling the timing of servo pulses in a disk drive in consideration of the amount of spindle jitter generated when a disk rotation speed is changed. The method of controlling the timing of a sector pulse for write operation includes: measuring a spindle jitter value in a data write mode; generating a timing correction value of a sector pulse, which indicates a position of a sector where data is written, according to the measured spindle jitter value; and generating a sector pulse by reflecting the timing correction value of the sector pulse.Type: GrantFiled: May 16, 2005Date of Patent: October 21, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-deog Cho, Sang-hun Lee
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Patent number: 7430088Abstract: A retracting method of compensating for a time for parking and unloading with an additional floating force obtained by additionally operating a spindle motor for a predetermined period after a retract operation is started, a hard disk drive (HDD) adopting the method, and a computer readable recording medium having a program for performing the method. The retracting method of the hard disk drive to retract a head to a retract area in response to detection of a retract condition includes driving the spindle motor at least for a predetermined period at the beginning of a retract operation to rotate a disk. The spindle motor is additionally driven for the predetermined period after the retract operation is started such that an additional floating force can be obtained, and thus, a time for parking and unloading is compensated for, and a stable retract operation is performed.Type: GrantFiled: November 6, 2006Date of Patent: September 30, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Sang-hun Lee, Jae-deog Cho
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Publication number: 20080180826Abstract: A method of forming a servo sync mark patterns on a disk is disclosed wherein alternating even-numbered and odd-numbered tracks are marked with a first servo sync mark pattern on the even-numbered tracks, and a second servo sync mark pattern, different from the first servo mark pattern, on the odd-numbered tracks. A write operation is controlled in an HDD in relation to either a first sync mark pattern or a second sync mark pattern read from a servo region of a current track and an expected sync mark pattern associated with a target track indicated by the write operation.Type: ApplicationFiled: August 20, 2007Publication date: July 31, 2008Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: Jae-deog CHO
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Patent number: 7218467Abstract: A method and apparatus for optimizing write properties of a magnetic head capable of performing read/write functions on a medium including defining the magnetic head as a normal head, a low temperature weak write (WW) head, or a high temperature WW head, and optimizing the write properties using optimal over shoot control (OSC) and write current (WC) according to the defined kind of magnetic head. Accordingly, the magnetic head in a hard disk drive (HDD) can be defined as the normal head, the low temperature WW head, or the high temperature WW head. Since the method uses the optimal OSC and WC values, according to the defined kind of magnetic head, in consideration of writability of the magnetic head and environmental temperature, low temperature or high temperature WW problems are avoided.Type: GrantFiled: September 17, 2004Date of Patent: May 15, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Jong-yoon Kim, Jae-deog Cho, Seong-hwan Yu
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Publication number: 20070103809Abstract: A retracting method of compensating for a time for parking and unloading with an additional floating force obtained by additionally operating a spindle motor for a predetermined period after a retract operation is started, a hard disk drive (HDD) adopting the method, and a computer readable recording medium having a program for performing the method. The retracting method of the hard disk drive to retract a head to a retract area in response to detection of a retract condition includes driving the spindle motor at least for a predetermined period at the beginning of a retract operation to rotate a disk. The spindle motor is additionally driven for the predetermined period after the retract operation is started such that an additional floating force can be obtained, and thus, a time for parking and unloading is compensated for, and a stable retract operation is performed.Type: ApplicationFiled: November 6, 2006Publication date: May 10, 2007Inventors: Sang-hun LEE, Jae-deog Cho
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Publication number: 20070019320Abstract: A method of controlling recording and a hard disk drive (HDD) using the same. The HDD has heads in which a write head and a read head are spaced apart from each other by a predetermined gap in a track direction, and the method includes: reading a table having a head gap time corresponding to the gap between the write head and the read head and a disk linear velocity; and beginning a write operation by delaying the write operation by the head gap time from a data sector pulse. Accordingly, since a gap between a servo sector and a data sector and between data sectors can be reduced by the length corresponding to a head gap time, the usage efficiency of a data area can be increased.Type: ApplicationFiled: July 7, 2006Publication date: January 25, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: Jae-deog Cho
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Patent number: 7110197Abstract: A method for determining a type of a head in a hard disc drive, the head being a normal head, a weak head, or an ATE (Adjacent Track Erasure) head, and a method for adjusting a write parameter using the head type determining method. The head type determining method includes writing data via the head under multiple tracks per inch (TPI) conditions, in which TPIs are equal to a reference TPI, and wider and narrower than the reference TPI by a respective first and second predetermined ratios, and reproducing the written data, to detect a bit error rate under each TPI condition, and comparing the bit error rate under each condition to the bit error rate of the reference TPI, to determine a type of a head.Type: GrantFiled: September 28, 2004Date of Patent: September 19, 2006Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-deog Cho
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Patent number: 7095576Abstract: A method and apparatus for controlling a write current capable of improving an adjacent track erasure (ATE) property of a hard disk drive. The method for controlling the write current in a hard disk drive includes applying overshoot current and write current to a head to write data on a disk, waiting for a predetermined time to pass, with the predetermined time being determined according to a thermal pole tip protrusion (TPTP) property of the head, and reducing the overshoot current and the write current upon passing of the predetermined time. Accordingly, since the overshoot current and the write current are decreased at the time of the TPTP being saturated, it is possible to effectively improve an ATE property of the hard disk drive.Type: GrantFiled: September 17, 2004Date of Patent: August 22, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Jong-yoon Kim, Jae-deog Cho, Seong-hwan Yu, Jin-wan Jun
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Patent number: 7088535Abstract: An off-track retry method for recovering data incorrectly read due to a read error caused by an off-track error in a disk drive. The off-track retry method includes extracting read gain characteristics while varying an off-track amount, determining an off-track amount, i.e., off-track direction and degree, based upon the read gain characteristics, reading data using the determined off-track amount, and determining whether the read data is normal and determining whether the data incorrectly read due to the read error has been recovered based upon the result.Type: GrantFiled: October 3, 2003Date of Patent: August 8, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Hwa-jun Kim, Jae-deog Cho
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Publication number: 20050264918Abstract: Provided is a method and apparatus for adaptively controlling the timing of servo pulses in a disk drive in consideration of the amount of spindle jitter generated when a disk rotation speed is changed. The method of controlling the timing of a sector pulse for write operation includes: measuring a spindle jitter value in a data write mode; generating a timing correction value of a sector pulse, which indicates a position of a sector where data is written, according to the measured spindle jitter value; and generating a sector pulse by reflecting the timing correction value of the sector pulse.Type: ApplicationFiled: May 16, 2005Publication date: December 1, 2005Applicant: Samsung Electronics Co., Ltd.Inventors: Jae-deog Cho, Sang-hun Lee
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Publication number: 20050146803Abstract: A method and apparatus for controlling a write current capable of improving an adjacent track erasure (ATE) property of a hard disk drive. The method for controlling the write current in a hard disk drive includes applying overshoot current and write current to a head to write data on a disk, waiting for a predetermined time to pass, with the predetermined time being determined according to a thermal pole tip protrusion (TPTP) property of the head, and reducing the overshoot current and the write current upon passing of the predetermined time. Accordingly, since the overshoot current and the write current are decreased at the time of the TPTP being saturated, it is possible to effectively improve an ATE property of the hard disk drive.Type: ApplicationFiled: September 17, 2004Publication date: July 7, 2005Applicant: SAMSUNG ELECTRONICS CO., LTDInventors: Jong-yoon Kim, Jae-deog Cho, Seong-hwan Yu, Jin-wan Jun
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Publication number: 20050078393Abstract: A method for determining a type of a head in a hard disc drive, the head being a normal head, a weak head, or an ATE (Adjacent Track Erasure) head, and a method for adjusting a write parameter using the head type determining method. The head type determining method includes writing data via the head under multiple tracks per inch (TPI) conditions, in which TPIs are equal to a reference TPI, and wider and narrower than the reference TPI by a respective first and second predetermined ratios, and reproducing the written data, to detect a bit error rate under each TPI condition, and comparing the bit error rate under each condition to the bit error rate of the reference TPI, to determine a type of a head.Type: ApplicationFiled: September 28, 2004Publication date: April 14, 2005Applicant: Samsung Electronics Co., Ltd.Inventor: Jae-deog Cho
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Publication number: 20050057835Abstract: A method and apparatus for optimizing write properties of a magnetic head capable of performing read/write functions on a medium including defining the magnetic head as a normal head, a low temperature weak write (WW) head, or a high temperature WW head, and optimizing the write properties using optimal over shoot control (OSC) and write current (WC) according to the defined kind of magnetic head. Accordingly, the magnetic head in a hard disk drive (HDD) can be defined as the normal head, the low temperature WW head, or the high temperature WW head. Since the method uses the optimal OSC and WC values, according to the defined kind of magnetic head, in consideration of writability of the magnetic head and environmental temperature, low temperature or high temperature WW problems are avoided.Type: ApplicationFiled: September 17, 2004Publication date: March 17, 2005Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jong-yoon Kim, Jae-deog Cho, Seong-hwan Yu
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Publication number: 20040078738Abstract: An off-track retry method for recovering data incorrectly read due to a read error caused by an off-track error in a disk drive. The off-track retry method includes extracting read gain characteristics while varying an off-track amount, determining an off-track amount, i.e., off-track direction and degree, based upon the read gain characteristics, reading data using the determined off-track amount, and determining whether the read data is normal and determining whether the data incorrectly read due to the read error has been recovered based upon the result.Type: ApplicationFiled: October 3, 2003Publication date: April 22, 2004Applicant: Samsung Electronics Co., Ltd.Inventors: Hwa-jun Kim, Jae-deog Cho