Abstract: According to one embodiment, an operating condition determining device includes a memory, and a processer. The memory is configured to store a plurality of classifications relating to information corresponding to a vibration state of a magnetic recording/reproducing device, and a plurality of setting parameter sets relating to an operation of the magnetic recording/reproducing device. The setting parameter sets correspond to the classifications. The processer is configured to acquire a first data. The first data includes information of the vibration state of the magnetic recording/reproducing device. The information is measured. The processer is configured to acquire one of the setting parameter sets from the memory. The one of the setting parameter sets corresponds to one of the classifications corresponding to the first data.

Abstract: According to one embodiment, an operating condition determining device includes a memory, and a processer. The memory is configured to store a plurality of classifications relating to information corresponding to a vibration state of a magnetic recording/reproducing device, and a plurality of setting parameter sets relating to an operation of the magnetic recording/reproducing device. The setting parameter sets correspond to the classifications. The processer is configured to acquire a first data. The first data includes information of the vibration state of the magnetic recording/reproducing device. The information is measured. The processer is configured to acquire one of the setting parameter sets from the memory. The one of the setting parameter sets corresponds to one of the classifications corresponding to the first data.

Abstract: According to one embodiment, a data processing device includes a processor. The processor acquires first features corresponding to a first classification label and second features corresponding to a second classification label. The processor selects at least a part of the first features from the first features, and at least a part of the second features from the second features. The processor performs a first operation. In the first operation, a first number of the at least a part of the selected first features is not less than 1.1 times and not more than 2 times a second number of the at least a part of the selected second features. The processor generates a first machine learning model based on first training data based on the at least a part of the selected first and second features.

Abstract: According to one embodiment, a magnetic reproducing and processing device includes an acquirer and a processor. The acquirer is configured to acquire a first electric signal obtained by reproducing information recorded in a first recording area of a magnetic recording medium by a first reproducing element and a second electric signal obtained by reproducing the information recorded in the first recording area by a second reproducing element. A first sensitivity of the first reproducing element to a magnetic signal recorded on the magnetic recording medium is different from a second sensitivity of the second reproducing element to the magnetic signal. The processor is configured to output a reproduced signal corresponding to the information recorded in the first recording area based on the first electric signal and the second electric signal acquired by the acquirer.

Abstract: According to one embodiment, a magnetic reproducing and processing device includes an acquirer and a processor. The acquirer is configured to acquire a first electric signal obtained by reproducing information recorded in a first recording area of a magnetic recording medium by a first reproducing element and a second electric signal obtained by reproducing the information recorded in the first recording area by a second reproducing element. A first sensitivity of the first reproducing element to a magnetic signal recorded on the magnetic recording medium is different from a second sensitivity of the second reproducing element to the magnetic signal. The processor is configured to output a reproduced signal corresponding to the information recorded in the first recording area based on the first electric signal and the second electric signal acquired by the acquirer.

Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer provided between the magnetic pole and the first shield, a second magnetic layer provided between the first magnetic layer and the first shield, and an intermediate layer provided between the first magnetic layer and the second magnetic layer. The intermediate layer is nonmagnetic. A first distance between the magnetic pole and the first magnetic layer along a first direction is not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction. The first direction is from the first magnetic layer toward the second magnetic layer.

Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer provided between the magnetic pole and the first shield, a second magnetic layer provided between the first magnetic layer and the first shield, and an intermediate layer provided between the first magnetic layer and the second magnetic layer. The intermediate layer is nonmagnetic. A first distance between the magnetic pole and the first magnetic layer along a first direction is not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction. The first direction is from the first magnetic layer toward the second magnetic layer.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes an output driver, a magnetic head, and a magnetic recording medium. The output driver outputs a recording signal corresponding to input information. The magnetic head includes a coil. A recording current includes the recording signal flows in the coil. Information corresponding to the input information is recorded in the magnetic recording medium. The input information includes first, second, and third information combinations. The first information combination includes first to fourth information. The second information combination includes fifth to eighth information. The third information combination includes ninth to twelfth information. The recording signal changes to an eleventh recording current to correspond to the eleventh information. The recording signal changes to a third recording current to correspond to the third information.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes an output driver, a magnetic head, and a magnetic recording medium. The output driver outputs a recording signal corresponding to input information. The magnetic head includes a coil. A recording current includes the recording signal flows in the coil. Information corresponding to the input information is recorded in the magnetic recording medium. The input information includes first, second, and third information combinations. The first information combination includes first to fourth information. The second information combination includes fifth to eighth information. The third information combination includes ninth to twelfth information. The recording signal changes to an eleventh recording current to correspond to the eleventh information. The recording signal changes to a third recording current to correspond to the third information.

Abstract: A magnetic recording apparatus in an embodiment includes a magnetic head, a storage, a detector, and a controller. The magnetic head records data on a recording medium. The storage stores first current parameters defining a first current waveform, second current parameters defining a second current waveform, and recording bit sequence information. The detector detects a discontinuity point from the recording bit sequence information. The discontinuity point is defined by a position at which recording bit lengths are discontinuous. The controller controls a waveform of a recording current of the magnetic head, based on the first current parameters at a recording bit that is not next to the discontinuity point and based on the second current parameters at a recording bit that is next to the discontinuity point.

Abstract: According to one embodiment, a magnetic head includes a magnetic pole, and a coil. The coil includes a first coil portion separated from the magnetic pole in a first direction. The magnetic pole includes a magnetic pole end portion, and first and second magnetic pole edge portions connected to the magnetic pole end portion. The first coil portion includes first and second coil edge portions, and a third coil edge portion overlapping the magnetic pole and being connected to the first and second coil edge portions. The first magnetic pole edge portion includes a first magnetic pole overlap portion overlapping the first coil edge portion. The second magnetic pole edge portion includes a second magnetic pole overlap portion overlapping the second coil edge portion. The magnetic pole end portion has a magnetic pole end portion center in a second direction connecting the first and second magnetic pole overlap portions.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium including a plurality of recording tracks, a magnetic head, and a controller. The plurality of recording tracks includes a first track. The controller causes the magnetic head to implement a first recording operation of recording first information in at least two of a plurality of first track recording components included in the first track. The controller causes the magnetic head to implement a first reproduction operation of reproducing the first information from a first information reproducing/recording component of one of the at least two of the plurality of first track recording components.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a processor. The magnetic head includes a first reproducing element portion and a second reproducing element portion. The processor is configured to acquire a first signal and a second signal, and to output an output signal according to either one of the first signal and the second signal. The first signal is obtained by reproducing information recorded on a first recording region by the first reproducing element portion. The second signal is obtained by reproducing the information recorded on the first recording region by the second reproducing element portion.

Abstract: According to one embodiment, a magnetic head includes first and second shields, a magnetic pole, and a trailing shield. The magnetic pole is provided between the first and second shields. The trailing shield is separated from the magnetic pole. The first shield includes first magnetic layers and first nonmagnetic layers arranged alternately along a first stacking direction. The first nonmagnetic layers include at least one selected from the group consisting of Ru, Cu, and Cr. Thicknesses of the first nonmagnetic layers each is not less than 0.3 nanometers and not more than 2.2 nanometers. The second shield includes second magnetic layers and second nonmagnetic layers arranged alternately along a second stacking direction. The second nonmagnetic layers include at least one selected from the group consisting of Ru, Cu, and Cr. Thicknesses of the second nonmagnetic layers each is not less than 0.3 nanometers and not more than 2.2 nanometers.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a processor. The magnetic head includes a first reproducing element portion and a second reproducing element portion. The processor is configured to acquire a first signal and a second signal, and to output an output signal according to either one of the first signal and the second signal. The first signal is obtained by reproducing information recorded on a first recording region by the first reproducing element portion. The second signal is obtained by reproducing the information recorded on the first recording region by the second reproducing element portion.

Abstract: According to one embodiment, a magnetic recording head includes a magnetic pole and a shield. The shield has a first opposing surface opposing the magnetic pole. The first opposing surface includes a first opposing portion. The magnetic pole and the first opposing portion overlap in a first direction from the magnetic pole toward the shield. The first opposing portion includes a first protrusion.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium including a plurality of recording tracks, a magnetic head, and a controller. The plurality of recording tracks includes a first track. The controller causes the magnetic head to implement a first recording operation of recording first information in at least two of a plurality of first track recording components included in the first track. The controller causes the magnetic head to implement a first reproduction operation of reproducing the first information from a first information reproducing/recording component of one of the at least two of the plurality of first track recording components.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a recording unit and a reproducing unit. The magnetic recording medium includes a first track and a second track, the first track extending in a first direction, the second track extending in the first direction and being arranged with the first track in a second direction intersecting the first direction. The first track includes first and second sub-tracks extending in the first direction. The second track includes third and fourth sub-tracks extending in the first direction. The second sub-track is disposed between the first and fourth sub-tracks. The third sub-track is disposed between the second and fourth sub-tracks. The recording unit records information in the first and second tracks. The reproducing unit reproduces first information recorded in the first track. The reproducing unit reproduces second information recorded in the second track.

Abstract: According to one embodiment, a magnetic recording head includes a magnetic pole and a shield. The shield has a first opposing surface opposing the magnetic pole. The first opposing surface includes a first opposing portion. The magnetic pole and the first opposing portion overlap in a first direction from the magnetic pole toward the shield. The first opposing portion includes a first protrusion.

Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a recording unit and a reproducing unit. The magnetic recording medium includes a first track and a second track, the first track extending in a first direction, the second track extending in the first direction and being arranged with the first track in a second direction intersecting the first direction. The first track includes first and second sub-tracks extending in the first direction. The second track includes third and fourth sub-tracks extending in the first direction. The second sub-track is disposed between the first and fourth sub-tracks. The third sub-track is disposed between the second and fourth sub-tracks. The recording unit records information in the first and second tracks. The reproducing unit reproduces first information recorded in the first track. The reproducing unit reproduces second information recorded in the second track.