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Researchers Submit Patent Application, "System and Method for Providing Controllable Steady State Current Waveshaping in a Hard Disk Drive (Hdd)...

September 2, 2014



Researchers Submit Patent Application, "System and Method for Providing Controllable Steady State Current Waveshaping in a Hard Disk Drive (Hdd) Preamplifier", for Approval

By a News Reporter-Staff News Editor at Information Technology Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Livshitz, Boris (Eagan, MN); Hoque, Anamul (Lakeville, MN); Goldberg, Jason (St. Paul, MN), filed on February 20, 2013, was made available online on August 21, 2014.

The patent's assignee is LSI Corporation.

News editors obtained the following quote from the background information supplied by the inventors: "Write current waveforms (e.g., write current waveshapes) are used in a preamplifier of a hard disk drive (HDD) to drive a write head which records data (e.g., bits of data, a data pattern) on a given track on a recording medium in the HDD. At high speeds, this write process in magnetic recording is challenging. For example, as data rates get faster and areal density increases, traditional (e.g., currently implemented) write current waveforms demonstrate degraded recording performance (e.g., degraded on-track and off-track recording performance). This degraded on-track performance is closely associated with track width modulation (e.g., track width widening) due to write head saturation and degraded bit-to-bit transitions. Further, with traditional write current waveforms, other problems that can occur are adjacent track erasure (ATE) and far track erasure (FTE), which affect off-track performance."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "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 and/or essential features of the claimed subject matter. Also, this Summary is not intended to limit the scope of the claimed subject matter in any manner

"Aspects of the disclosure pertain to a system and method for providing controllable steady state current waveshaping in a preamplifier of a data storage system.

DESCRIPTION OF THE FIGURES

"The detailed description is described with reference to the accompanying figures:

"FIG. 1 is an example conceptual block diagram schematic of a data storage system (e.g., hard disk drive (HDD)) in accordance with an exemplary embodiment of the present disclosure;

"FIG. 2 is a depiction of a write current waveform which is supported by (e.g., may be implemented with) the data storage system shown in FIG. 1 in accordance with an exemplary embodiment of the present disclosure;

"FIG. 3 depicts timing diagrams corresponding to signal outputs for the steady state current level block, the first OS block and the second OS block of the write block circuitry of the preamplifier, while also depicting timing diagrams corresponding to the data pattern to be recorded and the write current waveform, the data pattern and write current waveform being provided via an output from the preamplifier of the data storage system shown in FIG. 1 in accordance with an exemplary embodiment of the present disclosure;

"FIG. 4 depicts a write current waveform with a controllable steady state current level for a random data pattern in accordance with an exemplary embodiment of the present disclosure; and

"FIG. 5 is a flow chart illustrating a method for providing controllable steady state current waveshaping in a HDD preamplifier in accordance with an exemplary embodiment of the present disclosure."

For additional information on this patent application, see: Livshitz, Boris; Hoque, Anamul; Goldberg, Jason. System and Method for Providing Controllable Steady State Current Waveshaping in a Hard Disk Drive (Hdd) Preamplifier. Filed February 20, 2013 and posted August 21, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3880&p=78&f=G&l=50&d=PG01&S1=20140814.PD.&OS=PD/20140814&RS=PD/20140814

Keywords for this news article include: LSI Corporation, Information Technology, Information and Data Storage.

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Source: Information Technology Newsweekly


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