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Patent Application Titled "Methods for Formatting and Using Linear Recording Media Having a Reduced Servo Band Width" Published Online

September 4, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors Cherubini, Giovanni (Rueschlikon, CH); Jelitto, Jens (Rueschlikon, CH); Lantz, Mark A. (Adliswil, CH), filed on April 15, 2014, was made available online on August 21, 2014.

The assignee for this patent application is International Business Machines Corporation.

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to linear magnetic recording tapes and corresponding tape drive heads, and more specifically to linear magnetic tape using a timing-based servo technology that has smaller width servo bands and shorter servo frame length.

"Various data storage media and recording media such as magnetic tape, magnetic disks, optical tape, optical disks, holographic disks, holographic cards, and the like, allow for storage and retrieval of data. In particular, in magnetic media, data is typically stored as magnetic transitions, e.g., data is magnetically recorded on a surface of the media. The data stored is typically arranged in data tracks. A typical magnetic storage medium, such as a magnetic tape, typically includes several data tracks. Data tracks may be written and read individually, or sets of data tracks may be written and read in parallel. Optical media, holographic media and other media formats may also make use of such data tracks. Transducer (read/write) heads are positioned relative to the data tracks to read/write data along the tracks. Accordingly, a tape drive head locates each data track and accurately follows its path. To achieve this, servo techniques have been developed which allow for a precise positioning of the head relative to the data tracks. One such technique makes use of servo patterns, that is, patterns of signals or recorded marks on the medium, which are tracked by the head. The servo patterns are recorded on the recording medium such as to provide a position reference for the data tracks. In other words, a servo head reads a servo pattern, which is then interpreted by a servo controller into a position error signal (PES). The latter is then used to adjust the distance of the servo head relative to the servo pattern and thereby ensure a proper positioning of the transducers with respect to the set of data tracks.

"In a magnetic tape medium, the servo patterns are stored on dedicated tracks (called servo bands). A plurality of patterns may be defined within a servo band and a plurality of servo bands might be relied upon, the data tracks being arranged between the servo bands. A particular servo technique is the time-based servo (TBS) pattern, which makes use of non-parallel marks, to which time or distance variables may be associated. The time/distance offset between the detection of a set of servo marks is translated into a position signal. A PES may then be generated by subtracting a reference signal from the position signal to determine the position of transducer relative to a data track."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "In one embodiment, a method for using a linear magnetic recording medium is provided. The medium has a servo band having a width b that is less than or equal to about 1.2 B/N, where N is an integer greater than or equal to 2, and B corresponds to a distance between data read/write transducers of a magnetic head usable with the medium in a direction transverse to a longitudinal length of the medium. The method includes positioning a magnetic head in a first lateral medium region of the medium of width b with a first servo reader of at least one group of N servo readers of the magnetic head for reading the servo band, and positioning the magnetic head in a second lateral region of width b with a second servo reader of the at least one group of N servo readers for reading the servo band.

"In one embodiment, a method for formatting a linear magnetic recording medium includes writing at least one servo band to a magnetic medium, the at least one servo band having a servo pattern readable by a servo reader of a compatible magnetic head for positioning thereof. The servo pattern substantially fills a width b of the servo band. The servo band width b is less than or equal to about 1.2 B/N, where N is an integer greater than or equal to 2, and B corresponds to a distance between data transducers of the compatible magnetic head in a direction transverse to a longitudinal length of the medium.

"In yet another embodiment, a method is implemented in a system having a magnetic head with one or more groups of at least two servo readers, the magnetic head also having one or more groups of data read/write transducers spaced apart the distance B in the main direction of the head. The method includes positioning a first servo reader of a group of servo readers of a magnetic head in a first lateral medium region of a servo band having width b that is less than or equal to about 1.2 B/N, here N is an integer greater than or equal to 2, and B corresponds to a distance between data read/write transducers of the magnetic head in a direction transverse to a direction of travel of the medium relative to the head. A first read and/or write operation is conducted on a portion of a data band. A position of the magnetic head is adjusted during the first read and/or write operation based on signals from the first servo reader reading the servo band. A second servo reader of the group of servo readers of the magnetic head is positioned in a second lateral medium region of the servo band. A second read and/or write operation is conducted on another portion of the data band. A position of the magnetic head is adjusted during the second read and/or write operation based on signals from the second servo reader reading the servo band.

"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 DRAWINGS

"FIG. 1 schematically illustrates a prior art TBS linear tape medium.

"FIG. 2 schematically depicts a prior art pattern of a typical servo band.

"FIG. 3 depicts a prior art TBS system, wherein a tape drive head is operated along a linear tape medium.

"FIG. 4 illustrates a TBS system, according to one embodiment, wherein the tape drive head and the recording tape medium depicted correspond to two complementary embodiments.

"FIG. 5 represents a servo pattern of a servo band of a tape, according to one embodiment.

"FIG. 6 depicts a method for operating a TBS tape, according to one embodiment.

"FIG. 7 is a schematic diagram of a simplified tape drive system, according to one embodiment."

For more information, see this patent application: Cherubini, Giovanni; Jelitto, Jens; Lantz, Mark A. Methods for Formatting and Using Linear Recording Media Having a Reduced Servo Band Width. Filed April 15, 2014 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=3879&p=78&f=G&l=50&d=PG01&S1=20140814.PD.&OS=PD/20140814&RS=PD/20140814

Keywords for this news article include: International Business Machines Corporation.

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Source: Politics & Government Week


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