63results about "Digital recording" patented technology

To provide a magnetic recording device capable of stable recording operation.SOLUTION: A magnetic recording device 150 includes a magnetic recording medium group 20 and a magnetic head group 30. The magnetic recording medium group includes a first magnetic recording medium 21; a plurality of second magnetic recording media 22; and a plurality of third magnetic recording media 23. The magnetic head group includes a first magnetic head 31; a plurality of second magnetic heads 32; and a plurality of third magnetic heads 33. The first magnetic head can record data in the first magnetic recording medium by a first method. The plurality of second magnetic heads can record data in the plurality of second magnetic recording media by a second method. The plurality of third magnetic heads can record data in the plurality of third magnetic recording media by the second method. The first magnetic recording medium is provided between the plurality of second magnetic recording media and the plurality of third magnetic recording media in a first direction D1. The other magnetic recording medium in which the data is recorded by the first method does not overlap with the magnetic recording medium group in the first direction.SELECTED DRAWING: Figure 1

To provide a magnetic disk device capable of predicting whether error correction to a data track of a disk reaches a limit or not.SOLUTION: A magnetic disk device 1 includes a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit 65, and a determination unit. During the write period, the correction limit prediction unit 65 calculates the excess amount OVR, calculates the metric value Mer by multiplying the excess amount OVR by the first weighting factor, updates the cumulative metric value ME, and generates the first prediction information. The determination unit determines whether to cause the write processing unit to continue the write processing on the second data track based on the first prediction information.SELECTED DRAWING: Figure 18

The servo pattern recording method according to one aspect of the present technology involves recording a servo pattern in a plurality of servo bands that are arranged at intervals in the width direction of a magnetic layer in a magnetic tape, the method including: causing the magnetic tape to travel with a prescribed tension; and recording a servo pattern in the plurality of servo bands at a second pitch narrower than a first pitch, which is the positioning interval of two servo lead heads in a tape drive device that records data in the magnetic layer or that plays back data recorded in the magnetic layer.

The present invention provides a magnetic disk device that can efficiently record parity and has excellent error correction capabilities for user data on the disk. [Solution] The magnetic disk device comprises a disk DK, a write head WHD, a volatile buffer memory 80, a parity generation unit, a write processing unit 62, an error correction unit 64, a storage processing unit 65, and a normal correction limit prediction unit 66. The parity generation unit generates a first normal parity and a first strong parity based on first user data, and generates a second normal parity and a second strong parity based on second user data. The storage processing unit 65 overwrites the first recording area of ​​the buffer memory with the second strong parity if the first prediction information is normal information, and if the first prediction information changes to abnormal information, it leaves the first strong parity in the first recording area and stores the second strong parity in the second recording area of ​​the buffer memory.

The invention relates to the technical field of magnetic tape units, in particular to a magnetic tape driver, a magnetic tape unit and a storage system.The magnetic tape driver comprises a read head, an analog equalization circuit and a digital processing chip; the read head is coupled with the analog equalization circuit, the analog equalization circuit is coupled with the digital processing chip, and the analog equalization circuit comprises an active filter; wherein the read head is used for reading an original analog signal from a magnetic tape of a magnetic tape unit and outputting the original analog signal to the analog equalization circuit; the analog equalization circuit is used for performing data equalization on the original analog signal through an active filter to obtain a first analog signal and outputting the first analog signal to the digital processing chip; the frequency response curve of the first analog signal is closer to the frequency response curve of a target signal type than the frequency response curve of the original analog signal, and the target signal type comprises partial response signals; and the digital processing chip is used for converting the analog signal into a digital signal and processing the digital signal. According to the embodiment of the invention, the order of the digital filter in the magnetic tape unit can be reduced.

The embodiment of the invention provides a magnetic disk device capable of appropriately executing a rewrite operation caused by ATI. A controller of a magnetic disk device according to the present embodiment adds a count value corresponding to a storage region in the vicinity of one of a plurality of storage regions in accordance with a write operation. The rewriting operation includes a seek operation, a stabilization operation waiting for attenuation of residual vibration of the magnetic head, and a rewriting of all data in the first storage area to the first storage area after the stabilization operation. The controller reduces a value of a count corresponding to the first storage area among the plurality of counts in accordance with the rewrite operation. The controller adds a value of a count corresponding to the second storage area among the plurality of counts in accordance with the rewrite operation. The stabilization operation includes an operation for determining whether or not the stabilization operation has been completed on the basis of whether or not a first condition is satisfied. The first condition varies depending on the opportunity of the execution of the retry operation.

To provide a magnetic recording information processing device that reads information from a magnetic recording medium such as a magnetic card, in which information can be stably read over a wide range of head-to-medium speeds while suppressing cost increases.SOLUTION: A magnetic recording information processing device includes: an AD conversion unit 21 that converts a magnetic reproduction waveform into a digital signal; a memory 22 that accumulates the converted digital signal as data in a first sampling period; a thinning-out processing unit 23 that samples the converted digital signal at a second sampling period that is longer than the first sampling period; a demodulation processing unit 24 that executes a demodulation processing; and a control unit 25 that makes the demodulation processing unit 24 execute the demodulation processing in real-time based on the digital signal sampled by the thinning-out processing unit 23 and makes the demodulation processing unit 24 execute the demodulation processing based on the data accumulated data in the memory when the demodulation processing in real-time fails.SELECTED DRAWING: Figure 1

According to one embodiment, a magnetic disk device includes recording layers, write heads, read heads, a selector circuit that allows two or more read heads to be selected from among the read heads, a read target selection unit, a read processing unit, and a detection unit. When the read target selection unit selects the first recording layer and the second recording layer the read processing unit controls driving of the selector circuit and causes the selector circuit to select the first read head and the second read head to read data of the first recording layer and data of the second recording layer simultaneously, and the detection unit detects a state of the first recording layer and a state of the second recording layer.

The present invention provides a magnetic disk device that can improve the recording density of data on the disk and suppress the degradation of write performance. [Solution] During the first write period, if the determination unit 67 determines that the error correction of the first user data on the first data track has not exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the second management. If the determination unit 67 determines that the above error correction has exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the third management. During or after the first write period, the determination unit 67 instructs the management unit 65 to perform the process of saving the data belonging to the third group to a non-volatile recording medium.

A magnetic disk device capable of efficiently detecting defects on a disk is provided. [Solution] The magnetic disk device includes a plurality of recording layers L, a plurality of write heads WHD, a plurality of read heads RHD, a selection circuit 3Sb capable of selecting two or more read heads from the plurality of read heads RHD, a read target selection unit 64, a read processing unit 63, and a detection unit 65. When the read target selection unit 64 selects the first recording layer and the second recording layer, the read processing unit 63 controls the driving of the selection circuit 3Sb to cause the selection circuit to select the first read head and the second read head, and simultaneously reads data from the first recording layer and data from the second recording layer, and the detection unit 65 detects the state of the first recording layer and the state of the second recording layer.

According to one embodiment, a magnetic disk device includes a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit, and a determination unit. During a write period, the correction limit prediction unit calculates an excess amount, calculates a metric value by multiplying a first weight coefficient by the excess amount, updates a cumulative metric value, and generates first prediction information. The determination unit determines whether or not to allow the write processing unit to continue write processing for the second data track based on the first prediction information.

Maintains good write characteristics in a heat-assisted magnetic recording and playback device. [Solution] According to the embodiment, the adjustment method for a heat-assisted magnetic recording and playback device is an adjustment method for a heat-assisted magnetic recording and playback device equipped with a heat-assisted magnetic recording head and a heat-assisted magnetic recording medium, wherein the bit density in the starting area of ​​the recording band and in each area storing information other than user data is changed to be lower than the bit density of the areas other than the starting area in order to improve the write characteristics.

To provide a magnetic disk device capable of suitably performing rewrite operations caused by ATI (Automatic Time Indicator). [Solution] The controller performs an addition to the value of a counter corresponding to a neighboring memory area of ​​one of the multiple memory areas in response to a write operation. The rewrite operation includes a seek operation, a stabilization operation that waits for the residual vibration of the magnetic head to decay, and rewriting all the data of the first memory area to the first memory area after the stabilization operation. The controller decrements the value of the counter corresponding to the first memory area among the multiple counters in response to the rewrite operation. The controller performs an addition to the value of the counter corresponding to the second memory area among the multiple counters in response to the rewrite operation. The stabilization operation includes an operation that determines whether the stabilization operation is complete based on whether a first condition is met. The first condition differs depending on the trigger for executing the retry operation.

According to one embodiment, during a first write period, an adjustment unit derives a first predicted excess amount and a predicted upper limit threshold value, and a correction limit prediction unit calculates a first cumulative predicted excess amount. The determination unit causes the write processing unit to continue the write processing if determining that the first cumulative predicted excess amount is smaller than or equal to the predicted upper limit threshold value, and causes the write processing unit to suspend the write processing if determining that the first cumulative predicted excess amount exceeds the predicted upper limit threshold value.

According to one embodiment, a magnetic disk device includes a disk, a write head, and a write processing unit. The write processing unit executes first write processing of writing data to a first segment of a first data sector in a first data track. The write processing unit then executes second write processing of writing data to a first segment of a second data sector in the first data track. The write processing unit then executes third write processing of writing data to a second segment of the first data sector in a second data track.

According to one embodiment, a magnetic disk device includes a disk, a write head, and a write processing unit. The write processing unit executes first write processing of writing data to a first segment of a first data sector in a first data track. The write processing unit then executes second write processing of writing data to a first segment of a second data sector in the first data track. The write processing unit then executes third write processing of writing data to a second segment of the first data sector in a second data track.

To provide a data processing device, a magnetic recording / reproducing device, and a magnetic recording / reproducing system capable of deriving appropriate control conditions.SOLUTION: According to an embodiment, a data processing device includes an interface unit capable of acquiring partial data regarding control conditions of a magnetic recording / reproducing device and a processing unit capable of processing the partial data. The processing unit can process the partial data based on the characteristics of the partial data with a first model and derive first data. A first resolution of the first data is higher than a partial resolution of the partial data. The processing unit can process the partial data based on the characteristics with a second model and derive second data. The second mode is different from the first model and a second resolution of the second data is higher than the partial resolution.SELECTED DRAWING: Figure 1

According to an embodiment, a processing circuit of a magnetic disk device modulates a recording width in the radial direction of a first data sequence depending on a first combination and a second combination when writing data to a first track. The first track is adjacent to a second track in which data is already written. The first combination is a combination of the first data sequence that is data written to the first track and a second data sequence that is data already written to the second track. The second combination is a combination of polarities at the bit position of the first track and the bit position of the second track adjacent to each other in the radial direction.

According to one embodiment, a controller is configured to: set an increment amount for each of counters respectively corresponding to storage areas arranged in a radial direction of a magnetic disk; increment a value of a counter by the set increment amount for a storage area in the vicinity according to a write operation of writing data to the magnetic disk; execute, for each storage area, an operation of calculating a remaining number of write times, which is a number of write operations for a vicinity of one storage area that are executable until a value of a counter corresponding to the one storage area reaches a first threshold value, based on an increment amount for the one storage area; and execute a rewrite operation on each storage area in an order according to the remaining number of write times in an idle state.

The embodiment of the invention provides a magnetic disk device and method capable of efficiently executing rewriting related to ATI. A controller of an embodiment sets an increment for each of a plurality of counts corresponding to a plurality of storage regions arranged in a radial direction of a disk. The controller increments the value of the count related to the nearby storage area by a set increment in accordance with a write operation of writing data to the disk. The controller executes, for each of the memory regions, an operation of calculating a remaining write count on the basis of an increment related to one memory region, the remaining write count being the number of write operations that can be executed in the vicinity of the one memory region until the value of the count corresponding to the one memory region reaches a first threshold value. In the idle state, the controller performs a rewrite operation on the plurality of memory regions in an order corresponding to the number of remaining writes.

A disk drive device is provided that improves the reliability of information recorded on the disk. According to one embodiment, a disk drive device is provided comprising a disk, a head, a preamplifier, and a controller. The head writes information to the disk based on a write current. The preamplifier supplies write current to the head. The controller enables the preamplifier to perform zero-current control. Zero-current control is control that maintains the amplitude of the write current at zero. The controller can vary the time for maintaining the amplitude of the write current at zero according to the pattern of the written data.

To provide a hub, an information processing device, and a program capable of contributing to handling the hub according to change characteristics of a hub body.SOLUTION: In a hub management system 30 including a management device 32, a reader / writer 34, and an RFID tag 36, the hub 20 includes a hub body 48 around which a magnetic tape MT is wound, and an RFID 36 which is one example of a non-contact type storage medium provided in the hub body. In the non-contact type storage medium, a hub ID, which is one example of hub specifying information capable of specifying the hub body, is stored. Hub change characteristic information specifying change characteristics of the hub body is associated with the hub specifying information.SELECTED DRAWING: Figure 2

According to one embodiment, a magnetic disk device includes a disk, a write head, an adjustment unit, and a write processing unit. The adjustment unit adjusts each of a first adjustment value, a second adjustment value, and a third adjustment value. The write processing unit can select shingled magnetic recording and perform write processing based on the first to third adjustment values. When the number of the plurality of tracks of the band is t+1 and the number of unused sectors among the plurality of sectors of the band is e. The adjustment unit adjusts the first to third adjustment values to establish e<t.

According to one embodiment, a magnetic disk device includes a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit, and a determination unit. During a write period, the correction limit prediction unit calculates an excess amount, calculates a metric value by multiplying a first weight coefficient by the excess amount, updates a cumulative metric value, and generates first prediction information. The determination unit determines whether or not to allow the write processing unit to continue write processing for the second data track based on the first prediction information.

To provide a magnetic head and a magnetic recording device capable of improving characteristics.SOLUTION: The magnetic head 113 includes the reproducing portion 70. The reproducing part 70 includes the first shield 41 including the first shield region 41a, the second shield 42 including the second shield region 42b, the reproducing elements 20s, the first terminals 51 electrically connected to the first shield 41, the second terminals 52 electrically connected to the second shield 42, and the third terminals 53. The reproducing elements 20s include a first magnetic layer 21, a second magnetic layer 22, and a third magnetic layer 23. The first magnetic layer 21 is provided between the first shield region 41a and the second shield region 42b. At least a portion of the second magnetic layer 22 is provided between the first shield region 41a and the first magnetic layer 21. The third magnetic layer 23 is provided between the first shield 41 and at least a portion of the second magnetic layer 22. The third terminal 53 is electrically connected to the second magnetic layer 22.SELECTED DRAWING: Figure 4

To provide a magnetic recording device capable of improving recording density.SOLUTION: A magnetic recording device 210 includes a magnetic head 110 and a control unit 75. The magnetic head includes a first magnetic pole 31, a second magnetic pole 32, a magnetic element 20 provided between the first magnetic pole and the second magnetic pole, a first terminal T1 electrically connected to the first magnetic pole, a second terminal T2 electrically connected to the second magnetic pole, and a coil 30c. The control unit is electrically connected to the first terminal, the second terminal, and the coil. One end of the magnetic element is electrically connected to the first magnetic pole. The other end of the magnetic element is electrically connected to the second magnetic pole. The control unit can perform a recording operation. In the recording operation, the control unit supplies a recording current to the coil while applying an element voltage of a first voltage or more and a second voltage or less between the first terminal and the second terminal.SELECTED DRAWING: Figure 1

The present invention provides a magnetic recording medium having excellent electromagnetic conversion characteristics. 　This magnetic recording medium being tape-shaped comprises a base body, an undercoat layer, and a magnetic layer, in order. The magnetic layer contains hexagonal ferrite particles. The crystallite size calculated from a peak derived from the (1, 1, 0) plane of hexagonal ferrite, which has been obtained by measuring the magnetic layer using an oblique-incidence X-ray diffraction method, is from 11.0 to 15.0 nm.

The present invention provides a data processing device, a magnetic recording device, a method for manufacturing a magnetic recording device, and a data processing method that enable improved efficiency. [Solution] The data processing device includes an acquisition unit and a processing unit. The acquisition unit is configured to acquire a plurality of second data corresponding to at least a portion of waveform data including a first data. The processing unit is configured to perform a first operation and a second operation. In the first operation, the processing unit is configured to correct the first operation so that the difference between the first data and a fourth data obtained by interpolating a plurality of third data obtained by processing the plurality of second data by the first operation is reduced. In the second operation, the processing unit is configured to derive a plurality of sixth data by processing a plurality of fifth data by the corrected first operation.

A data storage device is disclosed comprising a top head actuated over a top surface of a first disk, a bottom head actuated over a bottom surface of the first disk, a top head actuated over a top surface of a second disk, and a bottom head actuated over a bottom surface of the second disk. A dual channel preamp circuit is coupled to the top and bottom heads of the first and second disks, wherein a selection signal is applied to the dual channel preamp circuit to select between the first disk and the second disk. A concurrent access operation of the top and bottom surface of the selected disk is executed using the dual channel preamp circuit.

One embodiment aims to provide a disk device that can properly back up data. [Solution] According to one embodiment, a disk device is provided having a disk medium, volatile memory, and a controller. The disk medium is on which first data is written. The first data includes an encryption key. The volatile memory is capable of temporarily storing second data. The controller includes a processor and non-volatile memory. The processor encrypts the second data with the encryption key when the power is cut off. The non-volatile memory stores the encrypted second data when the power is cut off.