News Column

Researchers Submit Patent Application, "Magnetic Head and Storage System", for Approval

February 4, 2014



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 Biskeborn, Robert G. (Hollister, CA); Liang, Jason (Campbell, CA), filed on September 17, 2013, was made available online on January 23, 2014.

The patent's assignee is International Business Machines Corporation.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to data storage systems, and more particularly, this invention relates to a magnetic head having spatially separated arrays of writers.

"In magnetic storage systems, data is commonly read from and written onto magnetic recording media utilizing magnetic transducers. Data is written on the magnetic recording media by moving a magnetic recording transducer to a position over the media where the data is to be stored. The magnetic recording transducer then generates a magnetic field, which encodes the data into the magnetic media. Data is read from the media by similarly positioning the magnetic read transducer and then sensing the magnetic field of the magnetic media. Read and write operations may be independently synchronized with the movement of the media to ensure that the data can be read from and written to the desired location on the media.

"An important and continuing goal in the data storage industry is that of increasing the density of data stored on a medium. For tape storage systems, that goal has lead to increasing the track density on recording tape, and decreasing the thickness of the magnetic tape medium. However, the development of small footprint, higher performance tape drive systems has created various problems in the design of a tape head assembly for use in such systems.

"When data is written to a tape, the span of data written is the span of the head elements. However, any expansion and contraction of the tape prior to reading results is similarly an expansion or contraction of the space between data tracks and, in turn, the span of written data. For instance, the width of the tape is known to change with changes in temperature (e.g. thermal expansion) and humidity (e.g. hygroscopic expansion). In addition, aging of the tape media tends to also change dimensions of the tape over time, adding to these effects for the cases of older tapes used for archiving data. Present tapes typically expand and contract by approximately 1 part in 1000, or 0.1%.

"For future generations of tape heads, minimizing the spacing between concurrently written tracks is desirable for the purpose reducing the hydroscopic and thermal effects of the tape. However, as writers get spaced closer together, signal crossover between writers may occur. This crossover significantly degrades the writing performance. As a result, how closely the writers may be spaced is dependent upon providing sufficient spacing therebetween to minimize such crossover."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "A magnetic head in yet another embodiment includes a first outer array of writers; a second outer array of writers; a first inner array of writers positioned between the first and second outer arrays; a second inner array of writers positioned between the first inner array and the second outer array; and an array of readers, at least some of the readers being generally aligned with the writers of the first and second outer arrays in a direction of media travel relative thereto, wherein the writers of the first inner array are misaligned with the writers of the first outer array relative to the direction of media travel.

"Other aspects and embodiments of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

"For a fuller understanding of the nature and advantages of the present invention, as well as the preferred mode of use, reference should be made to the following detailed description read in conjunction with the accompanying drawings.

"FIG. 1 is a schematic diagram of a simplified tape drive system according to one embodiment.

"FIG. 2A illustrates a flat-lapped bi-directional, two-module magnetic tape head which may be implemented in the context of the present invention.

"FIG. 2B a partial tape bearing surface view of a magnetic tape head.

"FIG. 3A is a partial tape bearing surface view of a magnetic head presented as a comparative example.

"FIG. 3B is a partial tape bearing surface view of a magnetic head according to an embodiment of the present invention.

"FIG. 3C is a partial tape bearing surface view of a magnetic head according to another embodiment of the present invention.

"FIG. 3D is a partial tape bearing surface view of a magnetic head according to yet another embodiment of the present invention.

"FIG. 4 illustrates a magnetic head according to one embodiment of the present invention.

"FIG. 5 illustrates a magnetic head according to one embodiment of the present invention including outriggers formed on outer modules.

"FIG. 6 illustrates a magnetic head according to one embodiment of the present invention where modules are in a tangent (angled) configuration.

"FIG. 7 illustrates a magnetic head according to one embodiment of the present invention including modules in an overwrap configuration

"FIG. 8 illustrates a magnetic head according to one embodiment of the present invention where a substrate of a module is coupled to a closure."

For additional information on this patent application, see: Biskeborn, Robert G.; Liang, Jason. Magnetic Head and Storage System. Filed September 17, 2013 and posted January 23, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3916&p=79&f=G&l=50&d=PG01&S1=20140116.PD.&OS=PD/20140116&RS=PD/20140116

Keywords for this news article include: Information Technology, Information and Data Storage, International Business Machines Corporation.

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Source: Information Technology Newsweekly


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