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公开(公告)号：US11887636B2
公开(公告)日：2024-01-30
申请号：US18298730
申请日：2023-04-11
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Yuto Murata , Nagisa Yamasaki
CPC分类号： G11B5/70 , G11B5/00813 , G11B5/00826 , G11B5/4893 , G11B5/00856 , G11B5/7356 , G11B2220/90 , G11B2220/956
摘要： The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
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公开(公告)号：US11853580B1
公开(公告)日：2023-12-26
申请号：US17809909
申请日：2022-06-30
发明人： Noriko Yamamoto , Atsushi Abe , Tsuyoshi Miyamura , Tohru Hasegawa , Hiroshi Itagaki , Shinsuke Mitsuma
CPC分类号： G06F3/0647 , G06F3/0607 , G06F3/0686 , G11B5/00813
摘要： A computer implemented method includes obtaining positional information corresponding to end of data (EOD) on a tape and a data extent stored in the tape, wherein the positional information includes longitudinal position (LPOS), latitudinal position (wrap), and number of data blocks, comparing a block number of at least one of a currently read or located data with the positional information of the data extent to identify a current position of a tape head, identifying a positional relationship between a location of data to be read, the positional information of the EOD on the tape, and the current position of the tape head, identifying a directional relationship between a current direction of the tape head locating to data to be read and a pending write direction, and determining an appendable range for data after the EOD on the tape based on the identified positional relationship and the identified directional relationship.
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13.发明公开公开(公告)号：US20230410839A1
公开(公告)日：2023-12-21
申请号：US18333887
申请日：2023-06-13
发明人： Fumihiko NIMURA
CPC分类号： G11B5/008 , G11B20/10037
摘要： A magnetic recording information processing device which reads out information from a magnetic recording medium includes a magnetic head which reads the magnetic recording medium and outputs a magnetic reproduction waveform, an AD (analog-digital) conversion part which converts the magnetic reproduction waveform into a digital signal, a memory which accumulates the digital signal sampled at a first sampling period as data, a thinning-out processing part which samples the digital signal at a second sampling period longer than the first sampling period, a demodulation processing part which performs demodulation processing of the information, and a control part which causes the demodulation processing part to execute demodulation processing in real time based on the digital signal sampled by the thinning-out processing part. When the demodulation processing in real time has failed, the control part causes the demodulation processing part to execute demodulation processing based on the data accumulated in the memory.
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公开(公告)号：US11837263B1
公开(公告)日：2023-12-05
申请号：US17820731
申请日：2022-08-18
CPC分类号： G11B5/024 , G11B5/00813 , G11B5/325
摘要： Provided are a tape erase element, tape erase device, and method for forming a tape erase element to erase content of a tape medium. The tape erase element comprises a housing forming a gap extending along a length of an outer surface of the housing. The gap extends from the outer surface of the housing to open into an inner space formed within the housing. A magnet is positioned within the inner space of the housing and having a surface extending across the gap. The magnet produces a magnetic flux that extends through a tape contact zone extending across a portion of the outer surface of the housing and the gap to erase content on the tape medium as the tape guide rollers guide the tape medium across the housing through the tape contact zone.
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公开(公告)号：US11830532B2
公开(公告)日：2023-11-28
申请号：US17637549
申请日：2019-10-31
发明人： Masaru Terakawa , Minoru Yamaga
CPC分类号： G11B5/78 , G11B5/00813 , G11B5/70 , G11B5/714 , G11B23/107 , G11B25/06 , G11B15/60
摘要： Provided is a magnetic recording medium capable of implementing higher-density recording. This magnetic recording medium includes a substrate containing a polyester and a magnetic layer disposed on the substrate, including a plurality of types of magnetic powder. A surface of the magnetic layer has an arithmetic average roughness Ra of 2.5 nm or less. PSD to a spatial wavelength of 5 μm is 2.5 μm or less. The magnetic layer has an average thickness of 90 nm or less. The magnetic powder has an average aspect ratio of 1.0 or more and 3.0 or less. A coercive force in a perpendicular direction is 3000 oersted or less. A ratio of a coercive force in a longitudinal direction to the coercive force in the perpendicular direction is 0.8 or less. A half-value width of an isolated waveform in a reproduced waveform of a data signal is 200 nm or less.
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公开(公告)号：US20230360671A1
公开(公告)日：2023-11-09
申请号：US18354336
申请日：2023-07-18
申请人： FUJIFILM Corporation
发明人： Noriko OYANAGI
CPC分类号： G11B5/00813 , G11B5/71 , G11B5/70631 , G11B5/712
摘要： Provided are a magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including the magnetic tape. The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder. An amount of a fluid lubricant extracted from a surface of the magnetic layer after sliding on a magnetic head in an environment of a temperature of 60° C.±1° C. and a relative humidity of 10% is 50% or more of an amount of the fluid lubricant extracted from the surface of the magnetic layer before the sliding, on a mass basis.
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17.发明授权公开(公告)号：US11783852B2
公开(公告)日：2023-10-10
申请号：US17822133
申请日：2022-08-25
申请人： FUJIFILM CORPORATION
发明人： Michitaka Kondo , Yutaka Oishi , Takashi Miyamoto , Terue Watanabe , Koji Matsumura , Yuko Uno
IPC分类号： G11B5/008
CPC分类号： G11B5/00813
摘要： An information processing device selects, in a case where a plurality of pieces of data are collected and transmitted to a tape drive to be recorded on a magnetic tape, one mode of a first mode of transmitting a data group obtained by collecting the plurality of pieces of data without compression, to the tape drive, a second mode of transmitting a compressed data group in which the data group obtained by collecting the plurality of pieces of data is compressed, to the tape drive, or a third mode of transmitting a data group obtained by collecting a part of the plurality of pieces of data and remaining data, in which the part of the plurality of pieces of data is compressed and the remaining data is not compressed, to the tape drive, and transmits a data group generated in accordance with the selected mode, to the tape drive.
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公开(公告)号：US20230317103A1
公开(公告)日：2023-10-05
申请号：US17648758
申请日：2022-01-24
CPC分类号： G11B5/00813 , G11B5/667 , G11B5/672 , G11B5/676 , G11B5/65
摘要： A magnetic recording tape comprises a tape substrate, a perpendicular magnetic recording layer disposed over the tape substrate, and a soft-magnetic underlayer disposed between the recording layer and the tape substrate. The perpendicular magnetic recording layer comprises magnetic particles suspended in a binder material, and the soft-magnetic underlayer comprises a continuous film of soft-magnetic material. The magnetic particles in the recording layer comprise one of barium ferrite, strontium ferrite, epsilon iron oxide and chromium dioxide. Tape storage apparatus employing such tape is also provided. The apparatus comprises a read/write head having at least one probe write-head for writing data by perpendicular recording on magnetic tape, at least one reel of magnetic tape as defined above, and a tape transport mechanism for transporting the magnetic tape past the read/write head.
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公开(公告)号：US20230306991A1
公开(公告)日：2023-09-28
申请号：US17903870
申请日：2022-09-06
发明人： Syosuke MARUYAMA
CPC分类号： G11B5/09 , G11B5/0086 , G11B2220/2516 , G11B2220/63
摘要： According to an embodiment, on a first track of a magnetic disk, a plurality of first sectors in each of which a data segment is stored, and a second sector in which a parity for first error correction is stored are arranged in this order from a first position. A controller executes a first operation of sequentially reading a first data segment from each of the plurality of first sectors, and storing a group of the read first data segments in a buffer memory. The controller obtains a first parity from the group of the read first data segments. The controller starts a second operation of writing each first data segment in the group of the first data segments stored in the buffer memory, to a first sector that is a read source among the plurality of first sectors, and writing the first parity to the second sector, before the magnetic head reaches the first position.
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公开(公告)号：US11741992B2
公开(公告)日：2023-08-29
申请号：US16528458
申请日：2019-07-31
发明人： Kevin B. Judd , Randy C. Inch , Eiji Ogura , Ernest S. Gale , Pamela R. Nylander-Hill , Dale A. Christiansen , Paul M. Greco , Kevin D. Butt , Steven M. Wallace
CPC分类号： G11B15/18 , G11B5/00813
摘要： A method for characterizing a magnetic recording tape, according to one approach, includes measuring, using a magnetic head having servo readers of known pitch, a servo band difference at various locations along a length of a magnetic recording tape. The servo band difference measurements and/or derivatives thereof are stored in association with the magnetic recording tape. This procedure creates a characterization of the magnetic recording tape that is useful for assessing aging of the magnetic recording tape, as well as improving subsequent reading and/or writing operations.
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