Draft:Roger Wood
British-born electrical engineer in magnetic recording
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Roger Wood (born March 11, 1951) is a British electrical engineer whose work has been recognized as an IEEE Fellow and as a recipient of the IEEE Magnetics Society Achievement Award (2009), the society’s highest honor, for contributions to magnetic recording theory and system design.
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He is known for contributions spanning signal processing, recording physics, and system architecture in hard disk drives (HDDs), including early work on partial-response maximum-likelihood (PRML) signal processing, analysis of areal density limits, and the introduction of two-dimensional magnetic recording (TDMR).
Career
Ampex and PRML (1979–1985)
Wood joined Ampex Corporation in 1979, where he applied digital signal processing techniques to magnetic recording.[1] In 1984, he and colleagues demonstrated a prototype hard disk drive using partial-response maximum-likelihood (PRML) signal processing, replacing the peak-detection methods then standard in the industry.[2]
Although Ampex exited the HDD business before commercialization, PRML was subsequently adopted industry-wide and became the dominant read-channel architecture of the 1990s.[1]
IBM and the 1 Tb/in² analysis (1986–2002)
In 1986, Wood joined IBM and later the IBM Almaden Research Center, where he worked on advanced magnetic recording technologies.
In 2000, he published "The feasibility of magnetic recording at 1 terabit per square inch" in IEEE Transactions on Magnetics.[3] The paper analyzed the physical limits of longitudinal magnetic recording and identified perpendicular magnetic recording as a path toward higher densities.
This work has been described in subsequent literature as a milestone in the development of high-density magnetic recording.[4] It is also referenced in technical discussions of areal-density scaling.[5]
HGST and next-generation recording (2003–2017)
Following the transition of IBM’s HDD business to Hitachi, Wood joined Hitachi Global Storage Technologies (HGST) in 2003, where he contributed to the development and implementation of perpendicular magnetic recording technologies.[6]
An HGST white paper co-authored by Wood described key elements of perpendicular recording, including media and head technologies used in production systems.[7]
In 2009, he published "The feasibility of magnetic recording at 10 terabits per square inch", introducing the concept of two-dimensional magnetic recording (TDMR).[8] A review article in Proceedings of the IEEE described this work as "a seminal paper by Wood et al."[4]
Wood later presented work on TDMR developments at industry conferences, and has been cited in independent analysis of HDD technology trends, including a Forbes article by Tom Coughlin.[9] He has also been quoted as a subject-matter expert in Signal magazine, published by AFCEA.[10]
He retired in 2017 from Western Digital, which had acquired HGST.[11]
Research contributions
Wood’s work spans multiple areas of magnetic recording systems, including:
- Signal processing for magnetic recording channels (PRML)
- Detection theory and read-channel design
- Magnetics and recording media physics
- Servo systems and positioning technologies
- HDD system architecture
His work on areal-density scaling and advanced recording techniques is referenced in subsequent technical literature.[4]
Awards and recognition
Impact
Wood’s contributions to magnetic recording are documented in independent sources including the Computer History Museum and IEEE publications.[11]
His work spans key phases in the evolution of HDD technology, including PRML adoption, density scaling limits, perpendicular recording, and TDMR.
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