05/01/2014 | 03:32am US/Eastern
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By a News Reporter-Staff News Editor at Information Technology Newsweekly -- A patent application by the inventors Ying, Chu N. (Los Altos, CA); Chen, Lei (Sunnyvale, CA); Wang, Herjen (Sunnyvale, CA); Yen, Johnson (Milpitas, CA), filed on October 12, 2012, was made available online on April 24, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.
This patent application is assigned to LSI Corporation.
The following quote was obtained by the news editors from the background information supplied by the inventors: "Various data processing systems have been developed including storage systems, cellular telephone systems, and radio transmission systems. In such systems, data is transferred from a sender to a receiver via a storage media. For example, in a storage system, data is sent from a sender (e.g., a write function) to a receiver (e.g., a read function) via a storage media. As information is stored and transmitted in the form of digital data, errors are introduced that, if not corrected, can corrupt the data and render the information unusable. The effectiveness of any transfer is impacted by any losses in data caused by various factors.
"Storage systems, such as disk drives, typically include one or more disks (e.g., magnetic disks or other storage media). Data is stored on the disks as a series of concentric tracks each comprising a number of data sectors. Each data sector is formatted to include a preamble, a sync mark (e.g., syncMark), and a data field. The storage system includes a read channel that processes the acquisition preamble to adjust the magnitude of the read signal and synchronize timing recovery in sampled amplitude read channels so that it can accurately read the data field. The sync mark demarks the beginning of the data field. A sync mark detector within the read channel detects the sync mark, and enables operation of a channel decoder to begin decoding the detected data sequence. When the sync mark detector is unable to detect the sync mark, the read channel cannot synchronize to the data field. For example, the sync mark detector could miss detecting the sync mark due to signal defects where the read-back signal on the sync mark is destroyed or distorted beyond the tolerance of the sync mark detector. When this happens, the read channel will recognize that the sync mark was not detected by the sync mark detector and initiate a retry. The storage system will wait for the disk to complete a revolution, which increases the overall access time, and again attempt to accurately detect the sync mark. When the sync mark detector cannot detect the sync mark upon retry, a channel fault can occur and data from the sector could be lost."
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "Techniques are described for no sync mark retry to efficiently recover data that includes one or more data fragments missing a sync mark. In one or more embodiments, the techniques are implemented in a data processing apparatus, such as a read channel of a data storage system, and so forth. The data processing apparatus is configured to receive at least part of a data fragment read from a storage media into a register, wherein the data fragment is configured to be formatted with a preamble, a sync mark, and user data. Where a determination is made that the data fragment is missing a sync mark, a position in the data fragment is selected, and a sync mark is assumed at the selected position. The data is then processed assuming the sync mark is at the selected position of th e data fragment to determine whether the data converges. When a determination is made that the data converges, the data is recovered.
"This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
"The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference number in different instances in the description and the figures indicate similar or identical items.
"FIG. 1A is a diagrammatic illustration that depicts a data format of a magnetic disk having a plurality of concentric tracks comprised of a plurality of data sectors in accordance with an embodiment of the disclosure.
"FIG. 1B is a diagrammatic illustration depicting an example format for a data sector of the magnetic disk shown in FIG. 1A.
"FIG. 2A is a block diagram illustrating a read channel that implements no sync mark retry (NSMR) for data recovery in accordance with an embodiment of the disclosure.
"FIG. 2B is a block diagram that illustrates the Y buffer and NSMR of the read channel illustrated in FIG. 2A.
"FIG. 2C is a block diagram that illustrates operation of the control module and DFIR and ITI input data path modules of the NSMR shown in FIG. 2B.
"FIG. 3 is a diagrammatic illustration depicting the embodiment of a no sync mark retry (NSMR) searching window to a data fragment to select positions within the data fragment as assumed positions of the missing sync mark.
"FIG. 4 is a flow diagram that illustrates a method, in an embodiment, that is employed by a data processing apparatus, such as the read channel shown in FIG. 1, to recover data from a data fragment missing a sync mark.
"FIG. 5 is a block diagram that illustrates a storage system having a read channel that employs NSMR for data recovery in accordance with an embodiment of the disclosure.
"FIG. 6 is a block diagram that illustrates a wireless communication system having a receiver that employs NSMR for data recovery in accordance with an embodiment of the disclosure."
URL and more information on this patent application, see: Ying, Chu N.; Chen, Lei; Wang, Herjen; Yen, Johnson. Data Recovery Using No Sync Mark Retry. Filed October 12, 2012 and posted April 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4560&p=92&f=G&l=50&d=PG01&S1=20140417.PD.&OS=PD/20140417&RS=PD/20140417
Keywords for this news article include: LSI Corporation, Information Technology, Information and Data Processing, Information and Data Loss and Recovery.
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(c) 2014 Information Technology Newsweekly via VerticalNews.com
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