Hoa Hoang Luong

US Patent:

8103754, Jan 24, 2012

Filed:

May 2, 2002

Appl. No.:

10/138990

Inventors:

Hoa V. Luong - Fremont CA, US
Sushil Thomas - San Francisco CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 15/16
G06F 16/173

US Classification:

709223, 709225

Abstract:

A method for reserving a shared volume in a multiple node data storage system is disclosed. The method ensures that only one host at a time has access to the shared volume. As a result, the data/information stored in the shared volume cannot become corrupted due to multiple hosts accessing the shared volume at the same time through different nodes.

US Patent:

59639776, Oct 5, 1999

Filed:

Oct 9, 1997

Appl. No.:

8/947213

Inventors:

Clifford M. Gold - Fremont CA
Hang D. Nguyen - Fremont CA
George Li - Santa Clara CA
Minnie Uppuluri - San Jose CA
Hoa Luong - Fremont CA
Steve Paul - Santa Cruz CA
Bryan Mee - San Jose CA
Trinh Bui - San Jose CA

Assignee:

Quantum Corporation - Milpitas CA

International Classification:

G06F 1200

US Classification:

711156

Abstract:

A method of coordinating access to a data buffer including a plurality of data blocks, using a buffer list with a plurality of entries corresponding to the data blocks. Each buffer list entry includes: (i) a status code for indicating the status of data in the corresponding data block, and (ii) a partial address common to both the next buffer list entry and a data block corresponding to said next buffer list entry. A status code is selected from a cyclical set of sequential status codes having a period of N, the status codes sequentially, and alternately, representing the most recent history of a data block, including: (i) full status, indicating data in the data block has been retrieved from the storage device or is to be stored to the storage device, or (ii) empty status, indicating data transferred out of the data block to a host or to the storage device. A store flag maintains a status code representing empty status, and a retrieve flag maintains a status code representing full status. When storing data into the data buffer, locating a desired buffer list entry list with an empty status code by traversing the buffer list, calculating the address of each entry using the partial address in the previous entry, until the desired entry is found.

US Patent:

47837055, Nov 8, 1988

Filed:

May 19, 1987

Appl. No.:

7/052012

Inventors:

Ronald R. Moon - Santa Clara CA
Michael G. Machado - San Jose CA
Thomas G. Cooper - Palo Alto CA
Patrick M. Weiher - Los Altos CA
Curtis H. Bruner - Los Gatos CA
Mark E. Strysko - Sunnyvale CA
Gregg J. Uhlendorf - San Jose CA
Steven G. Campbell - San Jose CA
Tuong T. Quan - San Jose CA
Hoa V. Luong - Milpitas CA

Assignee:

Quantum Corporation - Milpitas CA

International Classification:

G11B 5596
G11B 555
G06F 1300

US Classification:

360 77

Abstract:

A disk data storage subsystem includes a head and disk assembly. A plurality of sectors in data tracks include a servo portion containing a prerecorded pattern of a plurality of repeating, time staggered, non-phase-coherent bursts, each burst having a predetermined integral fraction radial offset relative to the other bursts. The head is positionable relative to the tracks by a voice coil in response to information derived from a servo portion, a programmed microcontroller supervisor receives operational data storage and retrieval commands from a host system with which the subsystem is operationally associated and controls the position of the head during track seeking and following operations in response to servo information read by the head from each servo portion and further in response to the commands, an interface, with an SCSI interface controller, under the control of the microcontroller supervisor receives the commands and data blocks from the host system and for sending commands, status words and data blocks to the host system, a data sequencer and memory controller under the control of the microcontroller manages flow of data blocks to and from the disk via the head.

US Patent:

46690042, May 26, 1987

Filed:

Feb 27, 1986

Appl. No.:

6/834009

Inventors:

Ronald R. Moon - Santa Clara CA
Michael G. Machado - San Jose CA
Thomas G. Cooper - Palo Alto CA
Patrick M. Weiher - Los Altos CA
Curtis H. Bruner - Los Gatos CA
Mark E. Strysko - Sunnyvale CA
Gregg J. Uhlendorf - San Jose CA
Steven G. Campbell - San Jose CA
Tuong T. Quan - San Jose CA
Hoa V. Luong - Milpitas CA

Assignee:

Quantum Corporation - Milpitas CA

International Classification:

G11B 555
G11B 556

US Classification:

360 77

Abstract:

A high performance, low cost rotating disk data storage subsystem includes a head and disk assembly. A plurality of sectors in data tracks include a servo portion containing a prerecorded pattern of a plurality of repeating, time staggered, non-phase-coherent bursts, each burst having a predetermined integral fraction radial offset relative to the other bursts and having a constant frequency preamble field followed by a unique value field related to its burst spatial location. A head is positionable relative to the tracks in response to information derived from a servo portion, a programmed microcontroller supervisor for receives operational data storage and retrieval commands from a host system with which the subsystem is operationally associated and controls the position of the head during track seeking and following operations in response to servo information read by the head from each servo portion and further in response to the commands, an interface under the control of the microcontroller supervisor receives the commands and data blocks from the host system and for sending commands, status words and data blocks to the host system, a data sequencer and memory controller under the control of the microcontroller manages flow of data blocks to and from the disk via the head and stores the information read by the head means from said unique value fields for subsequent processing by the microcontroller. A servo burst pattern providing phase quadrature and absolute position information, a servo writer, a servo qualification area and a timer, a media defect management method, an amplitude measurement circuit, and a time division control program for the microcontroller are aspects of this invention.