Robert K Li

US Patent:

6385007, May 7, 2002

Filed:

Aug 29, 2000

Appl. No.:

09/652227

Inventors:

Robert Yuan-Shih Li - Fremont CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 3314

US Classification:

360 9702, 360 69

Abstract:

A system to control the interior temperature and particularly the slider and disk temperature of hard disk drives that utilizes the spindle motor to spin a fanning structure. The fanning structure is preferably integrated into the hard disk drive and initiates a cooling air stream that is directed within the contained interior of the hard disk drive toward a Peltier-element that drains the thermal energy into the surrounding environment. In an alternate embodiment, the fanning structure initiates an exterior air stream that provides a cooling air stream at the outside of the Peltier-element. The Peltier-element is controllable to decouple operational temperature variations from environmental temperature variations.

US Patent:

6401214, Jun 4, 2002

Filed:

Mar 4, 1999

Appl. No.:

09/262426

Inventors:

Robert Yuan-Shih Li - Fremont CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1100

US Classification:

714 6, 711112

Abstract:

A method in a data processing system for minimizing read/write errors caused by impaired performance of a hard disk drive during runtime operation of the hard disk drive. The runtime operation includes an active mode during which read/write operations are conducted and a standby mode which occurs while no read/write operation is underway. First, at least one performance parameter of a hard disk drive is monitored during a standby mode of operation. Next, in response to detecting a degraded value of the at least one performance parameter, performing preventive recovery action only during the standby mode of operation, such that the performance parameter is restored to an acceptable value without interfering with hard disk drive operation during an active mode.

US Patent:

6421193, Jul 16, 2002

Filed:

Jan 26, 1999

Appl. No.:

09/237398

Inventors:

Robert Yuan-Shih Li - Fremont CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 502

US Classification:

360 25, 360 53

Abstract:

A method and apparatus for compensating for multiple thermal asperity events in a sector. The present invention provides for the detection, recording and recovery from errors caused by multiple thermal asperities occurring in a single sector. The method includes detecting thermal asperity events in a sector, setting a flag indicating each occurrence of a thermal asperity event in the sector, maintaining a count of the detected thermal asperity events in the sector and recording a byte location for each of the detected thermal asperity events in the sector. The method further includes performing a data recovery procedure in response to the detected thermal asperity events. The data recovery procedure is performed using the flag settings and a location corresponding to the detected thermal asperity events. The data recovery procedure is performed using the count of the detected thermal asperity events. The setting of a flag includes setting a bit in a register.

US Patent:

6498693, Dec 24, 2002

Filed:

Aug 2, 1999

Appl. No.:

09/365429

Inventors:

Andrew Hoan Au - Palo Alto CA
Robert Li - Fremont CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 2736

US Classification:

360 31, 360 66, 360 75, 360 7702

Abstract:

Method and system aspects for calibrating an MR offset in an MR head are presented. A method aspect includes identifying an occurrence of a calibration condition to initiate an MR offset check, and performing the MR offset check to ensure an MR offset value has not changed beyond an acceptable tolerance in order to maintain proper servoing of the MR head. A system aspect includes a hard disk for storing data, a read/write MR head for reading and writing data to/from the hard disk, and a control unit. The control unit performs an MR offset calibration of an MR offset value for the read/write MR head in response to a calibration condition occurring in order to ensure maintenance of the MR offset value within an acceptable tolerance for proper servoing of the read/write MR head.

US Patent:

6988308, Jan 24, 2006

Filed:

Jan 18, 2002

Appl. No.:

10/053734

Inventors:

Christopher William Bergevin - San Jose CA, US
Carol Inouye Chiu - San Jose CA, US
Robert Yuan-Shih Li - Fremont CA, US
Albert Shou-Chi Su - San Jose CA, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 5/127
H04R 31/00

US Classification:

2960303, 29417, 2960308, 2960314, 2960315, 2960316, 2960318, 216 65, 3603241, 36032411, 36032412, 3603242, 360317, 427127, 427128, 451 4, 451 51

Abstract:

Hard biasing of a magnetoresistive sensor or a spin valve sensor in a magnetic read head is initialized by repeatedly applying a magnetic field to the hard biasing at any level of fabrication of the magnetic read head or any combination of levels of fabrication of the read head such as at the wafer level, row bar level, single slider level, head gimbal assembly (HGA) level and/or head stack assembly (HSA) level.

US Patent:

20140044128, Feb 13, 2014

Filed:

Aug 7, 2012

Appl. No.:

13/568856

Inventors:

Maya Suresh - Santa Clara CA, US
Chien-Hsien Wu - Cupertino CA, US
Michael Lau - Rockville MD, US
Robert (Yi) Li - Fremont CA, US
Morris Beatty - Redwood City CA, US

Assignee:

BROADCOM CORPORATION - Irvine CA

International Classification:

H04L 12/56

US Classification:

370390

Abstract:

Disclosed are various embodiments that provide serial replication of multicast packets by performing a first data fetch to fetch first data from a memory buffer, the first data comprising a first packet pointer representing a first packet and a replication number indication a number of times the first packet is to be replicated. Furthermore, various embodiments are directed to performing a second data fetch to fetch second data from a memory buffer, the second data comprising a first packet pointer representing a second packet and serially replicating the first packet and the second packet based at least in part upon the replication number and a predetermined threshold value.

US Patent:

62493949, Jun 19, 2001

Filed:

Feb 12, 1999

Appl. No.:

9/248804

Inventors:

Robert Yuan-Shih Li - Fremont CA
Hoan Andrew Au - Palo Alto CA
Peter Cheng-I Fang - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 2736

US Classification:

360 31

Abstract:

A method and apparatus for providing amplitude instability data recovery for AMR/GMR heads during amplitude loss using MSE and/or amplitude envelope detection procedures. The method includes (a) initiating a data recovery procedure by selecting a detection mode for detecting when an error condition occurs, (b) performing the selected detection mode, (c) determining a reset action for resetting the magnetic head, (d) performing the reset action to reset the magnetic head and (f) re-reading data in the track after performing the reset action. An embodiment of the invention further includes (g) determining whether the resetting of the magnetic head allowed recovery of the data in the track and (h) terminating the data recovery procedure when the data is recovered. An embodiment of the invention further includes (i) determining whether predetermined limits have been exhausted when the data is not recovered, (j) terminating the data recovery procedure when the predetermined limits have been exhausted and repeating steps (a)-(g) when the predetermined limits have not been exhausted. In an embodiment of the invention, the determining a reset action for resetting the magnetic head further includes applying a maximum write current to the head, toggling a head bias current, toggling the head bias current and the write current, or applying a reset pulse to the head.

US Patent:

60444878, Mar 28, 2000

Filed:

Dec 16, 1997

Appl. No.:

8/991431

Inventors:

Robert Y. Li - Fremont CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1108

US Classification:

714797

Abstract:

A data recovery scheme is disclosed wherein a majority voting scheme arrives at the correct data and resolves ties with a minimum number of reads. The method includes reading at least one instance of data including a first set of ECC checkbytes from a media, each instance of data and ECC checkbytes comprising a string of bits, forming a voting data string from a majority value for each bit position in the string of bits, generating a second set of ECC checkbytes using the voted data string and returning the voted data sting to a host if the second set of ECC checkbytes is equal to the first set of ECC checkbytes.

Address:

1725 Washington St APT 14, San Francisco, CA 94109

Phone:

(415)7759253

VIN:

WMWMF33567TT58296

Make:

MINI

Model:

COOPER

Year:

2007