News Column

Patent Issued for Writing in Hard Disk Drives

July 8, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- Marvell International Ltd. (Hamilton, BM) has been issued patent number 8760793, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Wu, Zining (Los Altos, CA).

This patent was filed on March 1, 2012 and was published online on June 24, 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 presently named inventor(s), 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 as prior art against the present disclosure.

"A hard disk drive is a common digital data storage device. A hard disk drive usually has a plurality of concentric tracks located on a surface of a disk. A write head writes data on the plurality of tracks, and a read head reads data from the plurality of tracks. Before writing data on a first track, it may take some time to substantially align the write head to the first track. If the alignment of the write head is not proper or if data is written on the first track before proper alignment of the write head, data in a neighboring second track (e.g., which is adjacent to the first track) may become corrupted due to the misalignment of the write head (e.g., while the misaligned write head writes data on the first track). Such corrupted data in the second track, for example, may create problem while the read head tries to read data from the second track.

"In a conventional hard disk drive, width of the tracks can be made larger to reduce the time it takes for the write head to be aligned to a track, while writing data on the track. However, this results in a decrease of a storage density of the conventional hard disk drive.

"In another conventional hard disk drive, the write head starts writing data on a track only after verifying that the write head is substantially aligned to the track on which data is to be written. However, in such a conventional hard disk drive, speed of writing data is affected (as the write head writes data only after such verification)."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "In various embodiments, there is provided a method comprising causing data to be written on a first track located on a disk; while writing the data on the first track, buffering, in a buffer module, the data; determining that while writing the data on at least a portion of the first track, a portion of a write head was offset with respect to the first track, such that at least the portion of the write head infringed on a second track; determining a direction of movement of the write head; and based on determining that the portion of the write head was offset and determining the direction of movement of the write head, selectively performing one of (i) using the data buffered in the buffer module to recover data of the second track, or (ii) discarding the data buffered in the buffer module. The data to be written on the first track is first data, and wherein the method further comprises based on determining the direction of movement of the write head, determining that the write head is not scheduled to write on the second track subsequent to writing the first data on the first track; and based on determining that the write head is not scheduled to write on the second track subsequent to writing the first data on the first track, reading second data from the second track, based on the first data and the second data, generating third data, and writing the third data on the second track.

"In an embodiment, there is also provided a control module comprising a buffer module, wherein based on a write head writing data on a first track of a disk, the buffer module is configured to buffer the data; a servo module configured to determine that while writing the data on at least a portion of the first track, a portion of the write head was offset with respect to the first track, such that at least the portion of the write head infringed on a second track of the disk, wherein the servo module is further configured to determine a direction of movement of the write head; and a data recovery module configured to, based on the direction of movement of the write head, selectively perform one of (i) using the data buffered in the buffer module to recover data of the second track, or (ii) discarding the data buffered in the buffer module. The data written on the first track is first data, and wherein the data recovery module is further configured to based on the direction of movement of the write head, determine that the write head is not scheduled to write on the second track subsequent to writing the first data on the first track; based on determining that the write head is not scheduled to write on the second track subsequent to writing the first data on the first track, read second data from the second track; based on the first data and the second data, generate third data; and write the third data on the second track.

"In an embodiment, there is also provided a method comprising aiming to align a write head with a first track for writing data on the first track of a disk, wherein the first track has a track center, wherein a second track of the disk is adjacent to the first track; and determining that the second track is scheduled to be written on subsequent to writing on the first track, wherein aiming to align the write head further comprises based on the determining, aiming to align the write head with respect to a modified track center of the first track.

"In an embodiment, there is also provided a method comprising causing first data to be written on a first track located on a disk; while writing the first data on the first track, buffering, in a buffer module, the first data; determining that while writing the first data on at least a portion of the first track, a portion of a write head infringed on a second track located on the disk, wherein the second track stored second data prior to writing the first data on the first track, wherein the second track stored third data subsequent to writing the first data on the first track, and wherein the third data is generated by corruption of the second data due to the portion of the write head infringing on the second track; in response to determining that the portion of the write head infringed on the second track: reading the third data from the second track, and recovering the second data from the third data and the first data buffered in the buffer module, to generate recovered second data."

For the URL and additional information on this patent, see: Wu, Zining. Writing in Hard Disk Drives. U.S. Patent Number 8760793, filed March 1, 2012, and published online on June 24, 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=8760793.PN.&OS=PN/8760793RS=PN/8760793

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

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Source: Information Technology Newsweekly


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