Patents by Inventor Chung-Nae Cho

Chung-Nae 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).

  • Method of detecting bad servo track in hard disk drive
    Patent number: 8014092
    Abstract: A method of detecting a bad servo track of an HDD includes measuring servo AGC of each of servo sectors of a servo track requiring determination of badness, calculating statistic data with respect to the measured servo AGC of each servo sector, and determining whether the servo track is bad based on the calculated statistic data. Since the badness of a servo track is determined based on the statistic data of the servo AGC, a bad servo track generated due to a change in the overall magnitude of a servo signal is easily detected so that reliability in the detection of a detective servo track can be improved.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: September 6, 2011
    Assignee: SAMSUNG Electronics Co., Ltd.
    Inventors: Ho-Joon Choi, Chung-Nae Cho, Seung-Taek Lee
  • METHOD OF DETECTING BAD SERVO TRACK IN HARD DISK DRIVE
    Publication number: 20090196137
    Abstract: A method of detecting a bad servo track of an HDD includes measuring servo AGC of each of servo sectors of a servo track requiring determination of badness, calculating statistic data with respect to the measured servo AGC of each servo sector, and determining whether the servo track is bad based on the calculated statistic data. Since the badness of a servo track is determined based on the statistic data of the servo AGC, a bad servo track generated due to a change in the overall magnitude of a servo signal is easily detected so that reliability in the detection of a detective servo track can be improved.
    Type: Application
    Filed: January 30, 2009
    Publication date: August 6, 2009
    Inventors: Ho-Joon Choi, Chung-Nae Cho, Soung Taek Lee