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41.发明授权Read retry operations with read reference voltages ranked for different page populations of a memory 有权读取重试操作，读取的参考电压按不同页面的内存数量排列公开(公告)号：US09563502B1
公开(公告)日：2017-02-07
申请号：US15205616
申请日：2016-07-08
Applicant: Seagate Technology LLC
Inventor： AbdelHakim S. Alhussien , Sundararajan Sankaranarayanan , Thuy Van Nguyen , Ludovic Danjean , Erich F. Haratsch
IPC: G06F11/10 , G11C16/28 , G11C29/42 , G11C29/52 , H03M13/11 , G11C16/16 , G11C11/56 , G11C16/26 , G11C16/04 , G11C16/34 , G06F12/02 , H03M13/05 , G06F11/00
CPC classification number: G06F11/1048 , G06F11/00 , G06F11/10 , G06F11/1012 , G06F11/1072 , G06F12/02 , G11C11/56 , G11C11/5642 , G11C16/04 , G11C16/16 , G11C16/26 , G11C16/28 , G11C16/3431 , G11C29/021 , G11C29/028 , G11C29/42 , G11C29/52 , H03M13/05 , H03M13/1102
Abstract: Methods and apparatus are provided for read retry operations with read reference voltages ranked for different page populations of a memory. One method comprises obtaining a plurality of rankings of a plurality of read reference voltages for a plurality of page populations, wherein the rankings are based on a predefined performance metric; and reading a codeword from the memory a plurality of times, wherein each of the read operations uses a different one of the plurality of read reference voltages selected based on the rankings of the plurality of read reference voltages. The performance metric comprises, for example, a bit error rate, a bit polarity disparity, a substantially minimal syndrome weight and/or measures of an average system latency or a tail latency. The ranking is optionally based on a size of the page populations that had each of the ranked read reference voltages. Channel estimation is performed separately for each of the plurality of page populations.
Abstract translation: 提供了用于读取重试操作的方法和装置，其具有针对存储器的不同页面种群排列的读取参考电压。 一种方法包括为多个页面群体获得多个读取参考电压的多个排名，其中所述排名基于预定义的性能度量; 以及多次从存储器读取码字，其中每个读取操作使用基于多个读取参考电压的等级选择的多个读取参考电压中的不同的一个。 性能度量包括例如误码率，位极性差异，基本上最小的综合征权重和/或平均系统等待时间或尾部延迟的度量。 排名可选地基于具有每个排名的读取参考电压的页面群体的大小。 针对多个页面群体中的每一个分别进行信道估计。
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公开(公告)号：US20160118093A1
公开(公告)日：2016-04-28
申请号：US14990129
申请日：2016-01-07
Applicant: Seagate Technology LLC
Inventor： AbdelHakim S. Alhussien , Yunxiang Wu , Sundararajan Sankaranarayanan , Zhengang Chen , Erich F. Haratsch
IPC: G11C7/12
CPC classification number: G11C7/12 , G11C7/14 , G11C11/5642 , G11C13/004 , G11C16/26 , G11C16/28
Abstract: An apparatus having a circuit and a decoder is disclosed. The circuit is configured to adjust an initial one of a plurality of reference voltages in a read channel of a memory by shifting the initial reference voltage an amount toward a center of a window and read a codeword from the memory a number of times. The window bounds a sweep of the reference voltages. Each retry of the reads uses a respective reference voltage from a pattern of the reference voltages. The pattern is symmetrically spaced about the initial reference voltage. The pattern fits in the window. The decoder is configured to generate read data by performing an iterative decoding procedure on the codeword based on the reads.
Abstract translation: 公开了一种具有电路和解码器的装置。 电路被配置为通过将初始参考电压移向窗口中心的量来调整存储器的读通道中的多个参考电压中的初始值，并从存储器读取码字多次。 窗口限制了参考电压的扫描。 读取的每次重试使用来自参考电压的图案的相应参考电压。 该图案围绕初始参考电压对称地间隔开。 图案适合窗户。 解码器被配置为通过基于读取对码字执行迭代解码过程来生成读取数据。
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公开(公告)号：US09236099B2
公开(公告)日：2016-01-12
申请号：US14136283
申请日：2013-12-20
Applicant: Seagate Technology LLC
Inventor： AbdelHakim S. Alhussien , Yunxiang Wu , Sundararajan Sankaranarayanan , Zhengang Chen , Erich F. Haratsch
CPC classification number: G11C7/12 , G11C7/14 , G11C11/5642 , G11C13/004 , G11C16/26 , G11C16/28
Abstract: An apparatus having a circuit and a decoder is disclosed. The circuit is configured to (i) adjust an initial one of a plurality of reference voltages in a read channel of a memory by shifting the initial reference voltage an amount toward a center of a window and (ii) read a codeword from the memory a number of times. The window bounds a sweep of the reference voltages. Each retry of the reads uses a respective reference voltage from a pattern of the reference voltages. The pattern is symmetrically spaced about the initial reference voltage. The pattern fits in the window. The decoder is configured to generate read data by performing an iterative decoding procedure on the codeword based on the reads.
Abstract translation: 公开了一种具有电路和解码器的装置。 电路被配置为（i）通过将初始参考电压移向窗口中心的量来调整存储器的读通道中的多个参考电压中的初始值，以及（ii）从存储器a读取码字 次数。 窗口限制了参考电压的扫描。 读取的每次重试使用来自参考电压的图案的相应参考电压。 该图案围绕初始参考电压对称地间隔开。 图案适合窗户。 解码器被配置为通过基于读取对码字执行迭代解码过程来生成读取数据。
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44.发明授权公开(公告)号：US09184954B1
公开(公告)日：2015-11-10
申请号：US14322376
申请日：2014-07-02
Applicant: Seagate Technology LLC
Inventor： Abdel Hakim S. Alhussien , Ludovik Danjean , Sundararajan Sankaranarayanan , Erich F. Haratsch
CPC classification number: G11B20/1833 , G11B2020/185 , H03M13/114 , H03M13/27 , H03M13/6325 , H03M13/6343 , H04L25/06 , H04L25/067 , H04L27/22
Abstract: Systems and method relating generally to data processing, and more particularly to systems and methods for perturbing soft data in a layered decoder system.
Abstract translation: 一般涉及数据处理的系统和方法，更具体地涉及用于扰乱分层解码器系统中的软数据的系统和方法。
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45.发明授权Detecting track information from overlapping signals read from a data storage medium 有权从数据存储介质读取的重叠信号中检测轨道信息公开(公告)号：US09123356B2
公开(公告)日：2015-09-01
申请号：US13712913
申请日：2012-12-12
Applicant: Seagate Technology LLC
CPC classification number: G11B5/09 , G11B5/012 , G11B5/02 , G11B5/3977 , G11B20/10046 , G11B20/10212 , G11B2020/10953
Abstract: Detecting track information involves receiving first and second overlapping track signals from first and second read elements that read first and second tracks from a data storage medium. Information of the first and second tracks is estimated using the respective first and second track signals. An improved information estimate of the first track is obtained using the first track signal and the estimated information of the second track, and an improved information estimate of the second track is obtained using the second track signal and the estimated information of the first track. First and second track data are decoded using the respective improved information estimates of the first and second tracks.
Abstract translation: 检测轨道信息涉及从第一和第二读取元件接收从数据存储介质读取第一和第二轨道的第一和第二重叠轨道信号。 使用相应的第一和第二轨道信号来估计第一和第二轨道的信息。 使用第一轨道信号和第二轨道的估计信息获得第一轨道的改进的信息估计，并且使用第二轨道信号和第一轨道的估计信息来获得第二轨道的改进的信息估计。 第一和第二轨道数据使用第一和第二轨道的相应改进的信息估计被解码。
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Patent Agency Ranking
46.发明申请公开(公告)号：US20150003221A1
公开(公告)日：2015-01-01
申请号：US13931274
申请日：2013-06-28
Applicant: Seagate Technology LLC
Inventor： Sundararajan Sankaranarayanan , Raman Venkataramani , Rishi Ahuja
CPC classification number: G11B20/10046 , G11B13/045 , G11B20/10222
Abstract: Apparatus and method for recovering data from a multi-channel input signal, such as but not limited to a readback signal from a bit patterned medium (BPM) having a plurality of subtracks. In accordance with some embodiments, a single input single output (SISO) equalizer is adapted to generate equalized outputs responsive to alternating subchannels of the multi-channel input signal. A detector is adapted to generate estimates of data symbols represented by the input signal responsive to the equalized outputs. A switching circuit is adapted to switch in different equalizer coefficients for use by the SISO equalizer for each of the alternating subchannels in the input signal.
Abstract translation: 用于从多通道输入信号恢复数据的装置和方法，例如但不限于具有多个子轨道的位图形介质（BPM）的回读信号。 根据一些实施例，单输入单输出（SISO）均衡器适于产生响应于多通道输入信号的交替子信道的均衡输出。 检测器适于响应于均衡的输出而产生由输入信号表示的数据符号的估计。 开关电路适于切换不同的均衡器系数，供SISO均衡器用于输入信号中的每个交替子信道。
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公开(公告)号：US11024396B2
公开(公告)日：2021-06-01
申请号：US16518936
申请日：2019-07-22
Applicant: Seagate Technology LLC
Inventor： Zhengang Chen , Erich F. Haratsch , Sundararajan Sankaranarayanan
Abstract: Channel information and channel conditions determined by an Offline Tracking process are used to determine whether or not an adjustment to the read reference voltage can be avoided altogether without detrimentally affecting performance, or, alternatively, to determine a precision with which a read reference voltage adjustment should be made. If it is determined based on the channel conditions that a read reference voltage adjustment can be avoided altogether, read performance is improved by reducing the probability that a read reference voltage adjustment needs to be made during normal read operations. If it is determined based on the channel conditions that a read reference voltage adjustment needs to be made with a particular precision, the read reference voltage is so adjusted. This latter approach is advantageous in that relatively fewer adjustments will be made during normal read operations.
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公开(公告)号：US20210011631A1
公开(公告)日：2021-01-14
申请号：US16505909
申请日：2019-07-09
Applicant: Seagate Technology LLC
Inventor： Ludovic Danjean , Abdelhakim Alhussien , Sundararajan Sankaranarayanan , Erich Franz Haratsch
IPC: G06F3/06
Abstract: Systems and methods presented herein provide for mitigating errors in a storage device. In one embodiment, a storage system includes a storage device comprising a plurality of storage areas operable to store data, and a controller operable to evaluate operating conditions of the storage device, to perform a background scan on a first of the storage areas to characterize a read retention of the first storage area, and to adjust a read signal of the first storage area based on the characterized read retention and the operating conditions of the storage device.
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49.发明授权公开(公告)号：US10599355B2
公开(公告)日：2020-03-24
申请号：US15593439
申请日：2017-05-12
Applicant: Seagate Technology LLC
Inventor： Hongmei Xie , AbdelHakim S. Alhussien , Alex Ga Hing Tang , Sundararajan Sankaranarayanan , Erich F. Haratsch
Abstract: Data compression techniques are provided that remove redundancy across the boundary of compression search engines. An illustrative method comprises splitting the data frame into a plurality of sub-chunks; comparing at least two of the plurality of sub-chunks to one another to remove at least one sub-chunk from the plurality of sub-chunks that substantially matches at least one other sub-chunk to generate a remaining plurality of sub-chunks; generating matching sub-chunk information for data reconstruction identifying the at least one removed sub-chunk and the corresponding substantially matched at least one other sub-chunk; grouping the remaining plurality of sub-chunks into sub-units; removing substantially repeated patterns within the sub-units to generate corresponding compressed sub-units; and combining the compressed sub-units with the matching sub-chunk information to generate a compressed data frame. The data frame optionally comprises one or more host pages compressed substantially simultaneously, and the compressed data frame for a plurality of host pages compressed substantially simultaneously comprises a host page address for each host page.
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公开(公告)号：US10482983B2
公开(公告)日：2019-11-19
申请号：US15850273
申请日：2017-12-21
Applicant: Seagate Technology LLC
Inventor： Abdel Hakim Alhussien , Ludovic Danjean , Sundararajan Sankaranarayanan , Erich Franz Haratsch
Abstract: Apparatus and method for reducing read disturbed data in a non-volatile memory (NVM). Read operations applied to a first location in the NVM are counted to accumulate a read disturb count (RDC) value. Once the RDC value reaches a predetermined threshold, a flag bit is set and a first bit error statistic (BES) value is evaluated. If acceptable, the RDC value is reduced and additional read operations are applied until the RDC value reaches the predetermined threshold a second time. A second BES value is evaluated and data stored at the first location are relocated if an unacceptable number of read errors are detected by the second BES value. Different thresholds are applied to the first and second BES values so that fewer read errors are acceptable during evaluation of the second BES value as compared to the first BES value.
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