9results about "Patterned record carriers" patented technology

To accurately detect read errors in postcodes. [Solution] The magnetic disk device of the embodiment comprises a magnetic disk having a plurality of tracks, a magnetic head for reading and writing data to the magnetic disk, a plurality of servo regions provided on each of the plurality of tracks and including at least a portion of a first physical pattern which is the physical pattern after writing of a first data pattern including position information for each of the plurality of tracks, and a control unit for controlling the magnetic head. Each of the plurality of servo regions includes either a first servo region including the first physical pattern, or a second servo region including a second physical pattern which is the physical pattern after writing of a second data pattern different from the first data pattern, for each of the plurality of tracks, and the control unit determines whether the third servo region among the plurality of servo regions of the plurality of tracks has the first or the second physical pattern.

A magnetic disk device according to an embodiment includes: a magnetic disk including a plurality of tracks; a magnetic head that performs data reading and data writing on the magnetic disk; a plurality of servo regions that is provided in each of the plurality of tracks, and at least partially includes a first physical pattern, the first physical pattern being a physical pattern after writing of a first data pattern including position information of each of the plurality of tracks; and a controller that controls the magnetic head, wherein the plurality of servo regions includes one of a first servo region including the first physical pattern, and a second servo region including a second physical pattern, the second physical pattern being a physical pattern after writing of a second data pattern different from the first data pattern, for each of the plurality of tracks, and the controller performs determination as to which of the first and second physical patterns a third servo region has, the third servo region being one of a servo region among the plurality of servo regions included in the plurality of tracks.

The embodiment of the invention provides a tape reel, a tape unit, a storage system and a write servo driving system, relates to the field of storage, and is used for providing a servo pattern suitable for high-speed rotation of a tape. Servo patterns in the magnetic tape unit comprise the first servo stripe, the second servo stripe and the third servo stripe, servo position information can be obtained through the three servo stripes, the number of times of repetition of the servo stripes is small, calculation overhead is small, the resolving speed is high, and the method is suitable for high-speed scenes. Besides, compared with the fact that the first servo stripe and the third servo stripe are not parallel, under the same detection precision and servo pattern width, the first servo stripe and the third servo stripe are arranged in parallel, the inclination angles of the servo stripes in the servo pattern are few, the transverse distance of the servo pattern can be reduced, the frame rate of the magnetic tape unit is improved, and the method is suitable for high-speed scenes.

Provided is a disk device excellent in reliability, capable of writing a plurality of reference patterns to a disk at appropriate intervals without intersecting each other, and a reference pattern writing method thereof. Deviation of a writing position of a spiral pattern is detected, a prescribed speed is successively corrected in a direction in which the deviation disappears, and each spiral pattern is written based on the corrected prescribed speed.

Described are systems and methods for tri-level recording of bits on granular magnetic media, for example using a magnetic writer of a hard disk drive. Tri-level recording of bits involves recording magnetic states that can be read as three distinct levels by a magnetic reader. Tri-level recording within a single recording layer of the granular magnetic storage media can be accomplished by recording bits in a neutral bit state as well as in an up bit state and a down bit state. Neutral bits are recorded by doubling the write frequency so that the write field is reversed over the span of writing a single bit. The resulting neutral bit includes grains whose magnetic states are roughly evenly mixed between up states and down states.

A magnetic stack having a magnetic recording layer. The magnetic recording layer includes a plurality of ferromagnetic, discrete regions located within a matrix of at least one magnetic composition that is antiferromagnetic. Each ferromagnetic, discrete region corresponds to a magnetic domain for storing a bit of data. Related data storage devices, systems, and methods.

A magnetic stack having a magnetic recording layer. The magnetic recording layer includes a plurality of ferromagnetic, discrete regions located within a matrix of at least one magnetic composition that is antiferromagnetic. Each ferromagnetic, discrete region corresponds to a magnetic domain for storing a bit of data. Related data storage devices, systems, and methods.

A magnetic stack having a magnetic recording layer. The magnetic recording layer includes a plurality of ferromagnetic, discrete regions located within a matrix of at least one magnetic composition that is antiferromagnetic. Each ferromagnetic, discrete region corresponds to a magnetic domain for storing a bit of data. Related data storage devices, systems, and methods.

The embodiment of the invention relates to a magnetic disk device and a manufacturing method of the magnetic disk device. A magnetic disk device according to an embodiment includes: a magnetic disk having a plurality of tracks; the magnetic head is used for performing data reading and data writing on the magnetic disk; a plurality of servo regions provided in each of the plurality of tracks, at least a portion of the servo regions including a first physical pattern in which a first data pattern including positional information for each track of the plurality of tracks is written; and a control unit that controls the magnetic head, the plurality of servo regions including, for each of the plurality of tracks, one of a first servo region including a first physical pattern and a second servo region including a second physical pattern, which is a physical pattern in which a second data pattern different from the first data pattern is written, the control unit determines whether a third servo region of the plurality of servo regions of the plurality of tracks has the first physical pattern or the second physical pattern.