Steven R. (Steve) Hetzler  Steven R. (Steve) Hetzler photo       

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IBM Fellow and Manager, Cloud Data Architecture
Almaden Research Center, San Jose, CA, USA
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Professional Associations

Professional Associations:  American Physical Society (APS)  |  IEEE   |  IEEE Computer Society

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More information:  Steve's storage blog


2017

Disc storage cassettes
Altknecht, David J and Bethune, Donald S and Dyer, William M and Erpelding, A David and Hetzler, Steven R and Lawson, Drew B and Smith, Daniel F
US Patent 9,633,686
Abstract


2016

Extension of product codes with applications to tape and parallel channels
Mario Blaum, Roy D Cicedciyan, Steven R Hetzler, Thomas Mittelholzer
US Patent 9,252,815

High density hybrid storage system
Steven R Hetzler, Gary M McClelland, Robert M Rees
US Patent 9,263,082

Skewing expected wearout times of memory devices
Steven R Hetzler
US Patent 9,264,711

Negative select access mechanism
John S Best, Steven R Hetzler, Drew Lawson, Daniel F Smith
US Patent 9,373,353

Parity logs for RAID systems with variable capacity media
Mario Blaum, Veera W Deenadhayalan, Steven R Hetzler, Wayne C Hineman, Rees Robert M, Pin Zhou
US Patent 9,454,333

Time multiplexed redundant array of independent tapes
Mario M Blaum, Veera W Deenadhayalan, Steven R Hetzler, Wayne C Hineman, Rees Robert M, Pin Zhou
US Patent 9,495,247

Codes of length tn invariant under rotations of order n
John S Best, Mario Blaum, Steven R Hetzler
US Patent 9,454,426


2015

Bitmap compression for fast searches and updates
Mario Blaum, Alberto Nunez Covarrubias, Steven R Hetzler
US Patent 8,989,507

Multiple erasure correcting codes for storage arrays
Mario Blaum, James L Hafner, Steven R Hetzler, Daniel F Smith
US Patent 9,058,291

Wait-free stream oriented migration based storage
Steven Robert Hetzler, Mario H Lichtsinn, Hovey Raymond Strong Jr
US Patent 9,069,473


2014

Optimized flash based cache memory
Wendy A Belluomini, Binny S Bill, James L Hafner, Steven R Hetzler, Eyal Lotern, Venu G Nayar, Assaf Nitzan, Edi Shmueli, Daniel F Smith, Krishnakumar Rao Surigucchi
US Patent 8,645,619

System, method, and computer program product for skewing expected wearout times of memory devices
Steven Robert Hetzler, William John Kabelac
US Patent 8,661,187

Partial-maximum distance separable (PMDS) erasure correcting codes for storage arrays
Mario M Blaum, James L Hafner, Steven R Hetzler
US Patent 8,869,006

Tape drive with overlapped operations
David J Altknecht, John S Best, Steven R Hetzler, Gary M McClelland
US Patent 9,117,462


2013

System, method, and computer program product for determining a retention behavior for at least one block of a memory device having finite endurance and/or retention
Hetzler, Steven Robert and Kabelac, William John
US Patent 8,572,443
Abstract

System, method, and computer program product for estimating when a reliable life of a memory device having finite endurance and/or retention, or portion thereof, will be expended
Hetzler, Steven Robert and Kabelac, William John
US Patent 8,380,946
Abstract

System, method, and computer program product for estimating when a reliable life of a memory device having finite endurance and/or retention, or portion thereof, will be expended
Steven Robert Hetzler, William John Kabelac
US Patent 8,380,946

Storage system cache with flash memory in a raid configuration that commits writes as full stripes
Steven Robert Hetzler, Daniel Felix Smith
US Patent 8,484,408

System, method, and computer program product for determining a retention behavior for at least one block of a memory device device having finite endurance and/or retention
Steven Robert Hetzler, William John Kabelac
US Patent 8,572,443

Storage system cache using flash memory with direct block access
Wendy A Belluomini, Binny S Bill, James L Hafner, Steven R Hetzler, Venu G Nayar, Daniel F Smith, Krishnakumar Rao Surigucchi
US Patent 8,583,868

Nested multiple erasure correcting codes for storage arrays
Mario Blaum, James L Hafner, Steven R Hetzler
US Patent 8,433,979


2012

Incomplete write protection for disk array
Steven R Hetzler, Daniel F Smith
US Patent 8,214,684

Data storage array scaling method and system with minimal data movement
Steven Robert Hetzler
US Patent 8,239,622

System, method, and computer program product for analyzing monitor data information from a plurality of memory devices having finite endurance and/or retention
Steven Robert Hetzler, William John Kabelac
US Patent 8,316,173


2011

Multi-path data retrieval from redundant array
Steven Robert Hetzler, Daniel Felix Smith
US Patent 7,912,918

Data storage system and method
Steven R Hetzler, Daniel F Smith
US Patent 7,987,318


2010

Data storage system with power management control and method
Steven R Hetzler, Daniel Smith
US Patent 7,702,853

SCSI device translator for network
Steven R Hetzler, Daniel F Smith
US Patent 7,783,783


2009

Anamorphic codes
Steven Robert Hetzler, Daniel Felix Smith
US Patent 7,553,325


2008

Multipath data retrieval from redundant array
Steven Robert Hetzler, Daniel Felix Smith
US Patent 7,379,974


2007

Raid 3+ 3
Hetzler, Steven Robert and Smith, Daniel Felix and Winograd, Shmuel
US Patent 7,254,754
Abstract

Autonomic parity exchange
Steven Robert Hetzler, Daniel Felix Smith
US Patent 7,281,177

Raid 3+3
Steven Robert Hetzler, Daniel Felix Smith, Shmuel Winograd
US Patent 7,254,754


2006

On-drive integrated sector format raid error correction code system and method
Hideao Asano, Martin Aureliano Hassner, Nyles Norbert Heise, Steven R Hetzler, Tetsuya Tamura
US Patent 6,891,690

System and method for sequentially staging received data to a write cache in advance of storing the received data
Steven Robert Hetzler, Daniel Felix Smith
US Patent 7,010,645

Defect management for HDD with variable index architecture
Frank R Chu, Steven R Hetzler
US Patent 7,027,241

Generalized parity stripe data storage array
Martin Aureliano Hassner, Steven Robert Hetzler, Testuya Tamura, Barry Marshall Trager, Shmuel Winograd
US Patent 7,134,066

System and method for authenticating block level cache access on network
Steven Robert Hetzler, Daniel Felix Smith
US Patent 7,134,139


2005

Disk drive with servo synchronous recording
Steven R Hetzler, William John Kabelac
US Patent 6,873,483

Method for writing streaming audiovisual data to a disk drive
Steven R Hetzler, Daniel F Smith
US Patent 56,891,694

Integrated sector format-error correction code system and method for efficient writing in a disk array system
Martin Aureliano Hassner, Steven R Hetzler, Spencer W Ng
US Patent 6,928,515

Method and apparatus for servo defect management
Steven Robert Hetzler, Daniel James Malone
US Patent 6,950,265


2004

Intelligent electronic power controller
Frank Rui-Feng Chu, Steven R Hetzler
US Patent 6,725,385


2002

Intelligent data management fo hard disk drive
Chu, Frank and Hetzler, Steven
US Patent App. 10/195,478
Abstract


2001

Disk drive with sector numbers encoded by sequences of sector types
Mario Blaum, Steven R Hetzler, William John Kabelac
US Patent 6,288,861


2000

Method for adaptive formatting and track traversal in data storage devices
Steven R Hetzler, Prakash Kasiraj, Richard MH New
US Patent 6,137,644


1999

Servo-writing system for use in a data recording disk drive
Best, John Stewart and Chiang, Wen-Wei and Hetzler, Steven Robert and Horne, Donald Edward and Lee, Chih-Kung and Marrello, Vincent
US Patent 5,909,333
Abstract

Disk drive with identical top and bottom heads having three side-by-side elements and a common terminal pad
Robert Edward Fontan Jr, Steven Robert Hetzler, Hugo Alberto Emilio Santini, Mason Lamar Williams
US Patent 5,896,249

Disk drive using multiple servo timing marks that form a code of unique interrelated bit patterns
Mario Blaum, Steven Robert Hetzler, William John Kabelac
US Patent 5,903,410

Servo writing system for use in a data recording disk drive
John S Best, Wen-Wei Chiang, Steven Robert Hetzler, Donald Edward Horne, Chih-Kung Lee, Vincent Marrello
US Patent 5,909,333

System and method for skip-sector mapping in a data recording disk drive
Jeff J Dobbek, Steven Robert Hetzler
US Patent 5,937,435

Portable computer with adaptive demand-driven power management
Steven Robert Hetzler
US Patent 5,954,820

Defect tolerant binary synchronization mark
Mario Blaum, Steven Robert Hetzler, Glen Alan Jaquette, William John Kabelac
US Patent 5,999,110


1998

Disk drive with identical three-element, side-by-side heads on opposite disk surfaces
Fontana Jr, Robert Edward and Hetzler, Steven Robert and Santini, Hugo Alberto Emilio and Williams, Mason Lamar
US Patent 5,798,890
Abstract

Zoned recording embedded servo disk drive having no data identification fields and reduced rotational latency
Hetzler, Steven Robert and Kabelac, William John
US Patent 5,768,044
Abstract

Method and apparatus for servo control with high efficiency gray code for servo track ID
Steven Robert Hetzler, Louis Joseph Serrano
US Patent 5,757,567

Zoned recording embedded servo disk drive having no identification fields and reduced rotational latency
Steven Robert Hetzler, William John Kabelac
US Patent 5,768,044

Disk drive with identical three-element side-by-side heads on opposite disk surfaces
Robert Edward Fontan Jr, Steven Robert Hetzler, Hugo Alberto Emilio Santini, Mason Lamar Williams
US Patent 5,798,890


1997

Fixed-block architecture embedded servo disk drive without data identification (ID) fields
John S Best, Steven R Hetzler
US Patent 5,615,190

Disk drive for portable computer with adaptive demand-driven power management
Steven Robert Hetzler
US Patent 5,682,273


1996

Sector servo data recording disk having data regions without identification (ID) fields
John S Best, Steven R Hetzler
US Patent 5,500,848

Sector architecture for fixed block disk drive
Steven R Hetzler, William J Kabelac
US Patent 5,523,903

Banded magnetic recording disk with equally-angularly-spaced servo sector
Steven R Hetzler, William J Kabelac
US Patent 5,526,211


1995

Magnetic recording disk with equally-spaced servo sectors extending across multiple data bands
Hetzler, Steven R
US Patent 5,440,474
Abstract

Method for locating physical sectors in a fixed block architecture embedded servo disk file\# 14
Best, John S and Hetzler, Steven R
US Patent 5,438,559
Abstract

Efficient variable-block data storage system employing a staggered fixed-block-architecture array
Best, John S and Hetzler, Steven R and Hoyt, Roger F and Menon, Jaishankar M and Mitoma, Michael F
US Patent 5,459,853
Abstract

Method for locating physical sectors in a fixed block architecture embedded servo disk file\# 14
John S Best, Steven R Hetzler
US Patent 5,438,559


Steven R Hetzler
US Patent 5,440,474

Efficient variable-block data storage system employing a staggered fixed-block architecture array
John S Best, Steven R Hetzler, Roger F Hoyt, Jaishankar M Menon, Michael F Mitoma
US Patent 5,459,853


1994

Apparatus for controlling reading and writing in a disk drive
Steven R Hetzler
US Patent 5,285,327

Fixed block architecture disk file with improved position identification and error handling
Steven R Hetzler
US Patent 5,369,535


1993

Logical data tracks extending among a plurality of zones of physical tracks of one or more disk devices
Steven R Hetzler, Jaishankar M Menon, Michael F Mitoma
US Patent 5,202,799

Sectored servo independent of data architecture
Steven R Hetzler
US Patent 5,210,660

Retro-reflective variable-pitch diffraction grating for use in a rotary actuator disk file
Steven R Hetzler
US Patent 5,227,625


1991

Disk file or tape drive with high servo sample rate embedding additional servo sectors within individual data sectors
John S Best, Steven R Hetzler, William J Kabelac, David A Thompson
US Patent 5,073,834