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Patent Issued for Storage Device Interface for Shingled Magnetic Recording System

September 9, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- Marvell International Ltd. (Hamilton, BM) has been issued patent number 8817400, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Nangare, Nitin (Santa Clara, CA); Sheng, Hongying (San Jose, CA); Wong, Vincent (Fremont, CA); Burd, Gregory (San Jose, CA).

This patent was filed on November 2, 2011 and was published online on August 26, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the inventors hereof, to the extent the work is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted to be prior art against the present disclosure.

"This disclosure relates to a method and system for reading and writing data in an arrangement of tracks on a storage medium that is written and read by a head that moves relative to the surface of the storage medium. More particularly, this disclosure relates to a control interface for such a storage medium that facilitates compensating, during operation, for contributions to the signal from an adjacent track or tracks.

"In magnetic recording, as one example of a type of recording in which reading and writing are performed by a head that moves relative to the surface of the storage medium, data may be written in circular tracks on a magnetic disk. In some magnetic recording systems, track pitch was limited by the write head width. The read head was designed to be narrower than the write head so that reading can occur without picking up signals from any adjacent track. In addition, guard bands--empty bands on either side of each track--were provided to help prevent cases where data on one track are overwritten during writing of an adjacent track because of write head positioning errors.

"In order to increase recording densities, track pitch has been decreased and the guard bands between the tracks have been reduced or removed, to allow more tracks to fit on the recording medium. For example, in Shingled Magnetic Recording, the tracks are written so that one track partially overlaps the previous track. In such a system, track pitch theoretically may be arbitrarily small. However, if track pitch is narrower than the read head width, then the read head may pick up a significant amount of signals from one or more adjacent tracks, leading to low data reliability.

"Therefore, in order to further reduce the track pitch, it is necessary to mitigate the interference picked up from adjacent tracks during a read operation. If the component of the adjacent track picked up by the read head is sufficiently small, it may be possible to use knowledge of the data written on the adjacent track to carry out inter-track interference ('ITI') cancellation."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "A data storage device according to this disclosure includes a storage medium on which data is stored in overlapping tracks, a medium controller that directs storage of data on, and reading of data from, the storage medium, including encoding of data being stored and decoding of data being read. The decoding includes, when reading a first track, cancelling interference from a second track that overlaps the first track. The data storage device also includes a host controller in communication with the medium controller. The host controller includes memory that stores data decoded by the medium controller and data to be written by the medium controller. Communication between the medium controller and the host controller includes signals derived from the data on said first and second tracks for facilitating the cancelling.

"In the data storage device, the signals derived from the data may include timing information for determining relative alignment of the first and second tracks, and a signal indicating whether the data have been decoded successfully.

"In the data storage device, the communication may include writing of the signals derived from the first track to the memory for later use, as the signals derived from the second track, when reading a different track.

"A method of operating a data storage device according to this disclosure includes when reading a first track, cancelling interference from a second track that overlaps the first track, and facilitating the cancelling by communicating signals derived from the data on the first and second tracks.

"In the method, the signals derived from the data may include timing information for determining relative alignment of the first and second tracks, and a signal indicating whether the data have been decoded successfully.

"In the method, the communicating may include writing of the signals derived from the first track to a memory for later use, as the signals derived from the second track, when reading a different track.

"The method may also include reading the data from the first track, deriving a first group of the signals from the data from the first track, and storing the data from the first track and the first group of signals."

For the URL and additional information on this patent, see: Nangare, Nitin; Sheng, Hongying; Wong, Vincent; Burd, Gregory. Storage Device Interface for Shingled Magnetic Recording System. U.S. Patent Number 8817400, filed November 2, 2011, and published online on August 26, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8817400.PN.&OS=PN/8817400RS=PN/8817400

Keywords for this news article include: Information Technology, Information and Data Storage, Marvell International Ltd.

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Source: Information Technology Newsweekly


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