1
Guoxiao Guo Guoxiao Guo
Zhimin He, Guoxiao Guo, Hua Qian, EngHong Ong: Flexural pivot for rotary disc drive actuator. Seagate Technology, Derek J Berger, November 8, 2005: US06963472 (5 worldwide citation)

The present invention provides for a flexural pivot that can be fitted within a cavity of an actuator. The pivot includes a first member that can be coupled to the wall defining the cavity and a second member that can be mounted to the disc drive housing component of the disc drive. At least two lea ...


2
Andrew Bi Qiang
Yong Y Yang, Qiang Bi, Xiong Liu, ChoonKiat Lim: Squeeze evaluations that account for low frequency components, in a controller usable in a data handling system. Seagate Technology, David K Lucente, Derek J Berger, March 1, 2005: US06862155 (22 worldwide citation)

Position error values are obtained from a transducer head while following a plurality of servo tracks with a servo loop that band-blocks a frequency range that includes F, a nominal rotation frequency. An estimated difference distribution is derived from the position error values, the difference dis ...


3
Andrew Bi Qiang
Qiang Bi, Xiong Liu, LeeLing Tan, Wen Jun Cao, ChoonKiat Lim: Soft sensor for operating shock in a disc drive. Seagate Technology, David K Lucente, Derek J Berger, March 25, 2008: US07349174 (4 worldwide citation)

A method of preventing a write operation to a disc in a disc drive during a shock event without the use of a separate shock sensor comprises steps of monitoring an actuator voice coil motor (VCM) control plant output signal, generating an actuator voice coil motor (VCM) plant model module output sig ...


4
Krishna Rameshwara Malakapalli, Kinhing Paul Tsang: Mass storage error correction and detection system, method and article of manufacture. Seagate Technology, Kirk A Cesari, Derek J Berger, October 15, 2002: US06467060 (67 worldwide citation)

Data integrity is increased on mass-storage devices through a scheme whereby, a frame-based cyclic redundancy code (CRC) for each sector is recorded. A frame-based CRC is generated from the CRCs of the frames that compose a sector of data. In recording data, a CRC is generated from each frame, later ...


5
Peter I Vasiliev: Physical block address recovery apparatus system and method for cyclic error correction codes. Seagate Technology, Derek J Berger, Kirk A Cesari, June 3, 2003: US06574774 (50 worldwide citation)

The invention relates to apparatus and method that provide an improved media codeword and which can distinguish an uncorrectable data error from a wrong block address error and permit the address to be recovered from readback data. In accordance with one embodiment of the invention, method for gener ...


6
Clifton James Williamson, Schweiray Joseph Lee, Venkata Raja Gosula: Method and apparatus for error detection. Seagate Technology, David K Lucente, Derek J Berger, September 2, 2003: US06615387 (39 worldwide citation)

An error correction and miscorrection detection apparatus includes a memory buffer for storing user data contained in a data signal. A syndrome computer circuit generates a plurality of EDC syndromes form an EDC codeword. The EDC codeword includes user data encoded with a plurality of m-bit EDC pari ...


7
Gabor Szita: Correction of dynamic track spacing errors in storage devices. Seagate Technology, David K Lucente, Derek J Berger, August 31, 2004: US06785084 (35 worldwide citation)

The present invention offers a time efficient means to determine and eliminate dynamic track squeeze error. The present invention can be used to correct imperfections in tracks written by a conventional servowriter or using self-propagating servo writing. The dynamic track squeeze is determined with ...


8
Todd W Kube, Bruce Lynn Blakeslee, Alexander Wei Chang: Attachment of a head-gimbal assembly to a printed circuit board actuator arm using Z-axis conductive adhesive film. Seagate Technology, Derek J Berger, March 9, 2004: US06704165 (34 worldwide citation)

Method and apparatus for forming a disc drive actuator assembly. A rigid actuator arm formed of printed circuit board (PCB) material is configured for placement over a rotatable disc. A head-gimbal assembly (HGA) is provided comprising a data transducing head, a flexible suspension assembly and a co ...


9
Judy Lynn Westby: Method and dedicated frame buffer for loop initialization and responses. Seagate Technology, Kirk A Cesari, Derek J Berger, December 31, 2002: US06502189 (33 worldwide citation)

A fiber-channel loop interface circuit that includes a dedicated transmit-frame buffer for loop initialization and responses (“responses” are non-data frames sent in response to commands or inquiries from other nodes). Having a dedicated transmit-frame buffer allows one port of a dual-port node to b ...


10
Timothy Francis Ellis: Robust servo demodulation filtering method. Seagate Technology, Derek J Berger, January 13, 2004: US06678110 (30 worldwide citation)

A robust and efficient method for determining the location of a transducer head in a mass storage system. A position-indicative signal characterized by a fundamental frequency F is received from a data path including the transducer head. Energy in the signal at frequencies smaller than F/10 is subst ...