University of Minnesota
`Patent and Technology Marketing
`Office of Research and Technology Transfer
`1100 W ashin_gton A venue South, Suite 201
`Minneapolis, MN 55415-1226
`
`Number of Pages (including cover) :
`
`3
`
`Date: December 27, 1995
`
`To: Sharon D. Rotter
`NSIC
`
`Fax: (619) 621 - 2551
`
`Nathan A. Malek
`Marketing Assistant
`Tel. :
`612/625-7569
`Fax:
`612/624-4843
`E-mail:
`nathan@ortta.umn.edu
`
`From:
`
`Message
`
`RE : MTR Codes for Data Storage Systems
`U of MN Docket No. 96025
`
`Enclosed is a copy of the letter and invention summary sent to the NSIC members as you
`requested. We have not decided yet ifwe are going to patent this technology, although
`Samsung has stated their interest in covering the cost of patenting. We will notify the
`members 30 days before filing if that is what we decide to do.
`
`Best Regards,
`
`Nathan A. Malek
`
`UMN EXHIBIT 2015
`LSI Corp. et al. v. Regents of Univ. of Minn.
`IPR2017-01068
`
`
`Page 1 of 4
`
`

`

`UNIVERSITY OF MINNESOTA
`
`Patents and Technology Marketing
`Division of Mechanical, Chemical,
`Electrical and Biological Technologies
`
`Suite 201
`1100 Washington Avenue South
`Minneapolis, MN 55415-1226
`612- 624 - 3545
`Fax: 612 - 624 - 4843
`
`December 20, 1995
`
`RE : MTR Codes for Data Storage Systems
`U of MN Docket No. 96025
`NSIC/DARP A Ultra-High-Density Recording (UHDR) Project
`Magnetic Disk Component, Contract No. 972-93-1-009
`
`Dear NSIC Member :
`
`Enclosed is a one-page nonconfidential summary outlining the above referenced technology
`developed at the University of Minnesota by Professor J. Moon as part of the Ultra-High(cid:173)
`Density Recording (UHDR) Project for NSIC.
`
`If you are interested in reviewing the entire confidential report, please send your name, full
`company or University name, and full legal address to my attention within 30 days of receipt
`of this letter. I will forward our standard nondisclosure agreement for signature.
`
`A decision concerning patent protection has not yet been made. We are looking for sponsors
`who would be willing to help cover the cost of filing the patent. If you are interested, please
`contact me at your earliest convenience. I can be reached at (612) 625 - 7569 or by e-mail
`(nathan@ortta. umn. edu ).
`
`Sincerely,
`
`Nathan A Malek
`Technology Transfer Assistant
`
`Enclosure
`
`
`Page 2 of 4
`
`

`

`Invention Summary
`
`MTR Codes for Data Storage Systems
`
`U of MN Docket No. 96025
`
`The demand for greater densities in magnetic storage devices has created a need
`for data retrieval techniques with improved performance. A wide variety of detection and
`equalization methods have been proposed to address this need. This technology,
`developed by a team of Electrical Engineers here at the University, is a novel coding
`technique capable of significantly improving the reliability of sequence estimation
`detectors, such as fixed-delay tree search (FDTS).
`
`This coding scheme, designated maximum transition run (MTR), eliminates certain
`error-prone binary data patterns from the allowable set of input data patterns that are to be
`recorded in the storage medium. As a consequence, the final bit error rate, the most
`important performance measure of any digital recorder, is improved significantly when the
`original data bits are reproduced. This improvement in the bit error rate can also be
`traded for an increase in storage density if the error rate performance of the recorder is
`already satisfactory. More specifically, this new class of codes prohibit certain crowded
`transition patterns that can occur in a recorded sequence. This improves the detector
`performance by increasing the minimum distance for sequence estimator detector methods.
`
`Computer simulations have been used to demonstrate the performance advantage
`of the MTR code combined with a specific detector known as the fixed delay tree search
`(FDTS) with decision feedback over the existing code / detector combinations.
`
`~ 8
`a::
`0..
`~ 7
`0
`'E
`~ 6
`~
`[5
`§
`$4
`:8,
`a::
`~ 3
`
`---Rate 8/9 (0,4)
`---Rate 16/19 MTR
`
`..........
`Rate4/5MTR
`
`DE
`
`tau=4
`tau=3
`tau=2
`tau=1
`FDTS/DF Tree Depth
`
`tau=5
`
`Figure 1 : Summary ofFDTS/DF Performance at BER= 10·5
`
`For a user density of Du= 2.5, simulation results in Figure 1 show up to a 2 dB
`improvement in detector performance over the conventional (O,k) code. This novel
`coding technique results in significant performance gains ( estimated 20% to 40% increase
`in storage capacity~ without a corresponding increase in hardware complexity.
`
`
`Page 3 of 4
`
`

`

`< TRANSACTION REPORT>
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`12-27-1995(WED) 13:35
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`[ TRANSMIT
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`J
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`NO.
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`DATE
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`TIME
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`DESTINATION STATION
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`PG. DURATION MODE
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`RESULT
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`43013
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`12-27 13:34
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`619 621 2551
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`3
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`3
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`0° 01 '30" NORMAL
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`OK
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`0° 01 '30"
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`Page 4 of 4
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