170results about "Digital signal error detection/correction" patented technology

The present disclosure describes aspects of codeword interleaving over magnetic media surfaces. In some aspects, segments of a codeword are spread or interleaved across multiple surfaces of magnetic storage media. Data for one or more codewords may be received by a read / write channel and, for each codeword, a respective index is selected, received, or generated. The index may indicate which sector partitions of the multiple surfaces that segments of one of the codewords are to be written. The data of the codewords can be segmented and then arranged in an interleaver based on the respective index to which the codeword corresponds. The codeword segments are written from the interleaver to sectors of the multiple surfaces of the magnetic media. By so doing, codewords may be spread across multiple surfaces, such that a loss of a portion of a segment track does not prevent readback and decoding of the codewords.

According to the embodiment, an HDC receives a plurality of data segments from a host, and executes generation and addition of a first code and output of a data segment to which the first code is added to each data segment. An HDC calculates exclusive OR with respect to the first codes, and outputs obtained first information. The RWC performs data conversion and calculation of exclusive OR on the plurality of data segments to which the first code is added, and outputs the plurality of data segments after the data conversion and a track parity obtained by the calculation of the exclusive OR. The RWC acquires the first code from the plurality of data segments. The RWC calculates exclusive OR with respect to a group of the second codes which are the acquired first codes to acquire second information. The RWC compares the first information with the second information.

The system obtains performance signals associated with respective hard disks of a volume of hard disks including a plurality of hard disks that are dedicated to activities of a service. The system determines a volume failure prediction for the volume of hard disks by, for each respective hard disk of the volume of hard disks, determining a hard disk failure prediction. The system determines a hard disk failure prediction by: inputting the respective performance signals into a supervised machine learning model; and receiving as output from the machine learning model the hard disk failure prediction for the respective hard disk. The system based on the received outputs, determines that the volume failure prediction is associated with a migration condition. The system, responsive to determining that the volume failure prediction is associated with the migration condition, migrates data from the volume of hard disks to a second volume of hard disks.

A plurality of servo patterns are recorded in a magnetic tape along a longitudinal direction. The servo pattern is at least one linear magnetization region pair. The linear magnetization region pair includes a first linear magnetization region, which is linearly magnetized, and a second linear magnetization region, which is linearly magnetized. The first linear magnetization region and the second linear magnetization region are inclined in opposite directions with respect to a first imaginary straight line along a width direction of the magnetic tape. The first linear magnetization region has a steeper inclined angle with respect to the first imaginary straight line than the second linear magnetization region.

An error correction circuit, including an error correction code (ECC) encoder configured to generate parity data corresponding to main data based on a parity generation matrix, and to output a codeword including the main data and the parity data to a plurality of memory devices; and an ECC decoder configured to: read the codeword from the plurality of memory devices, generate a syndrome corresponding to the codeword based on a parity check matrix, detect an error pattern based on the syndrome, generate a plurality of estimation syndromes corresponding to the error pattern using a plurality of partial sub-matrices included in the parity check matrix, and correct an error included in the read codeword based on a result of a comparison between the syndrome and the plurality of estimation syndromes.

The invention discloses a video data access method and device based on cloud edge fusion, equipment and a medium, and relates to the technical field of data storage. According to the scheme, each group of video data is only correspondingly stored in one erasure data block in advance and does not cross the erasure data block for storage. When the distributed storage system enters a super fault domain due to faults of a plurality of nodes or disks and a video reading request is received, the distributed storage system can correct the number of erasure data blocks in a zero padding mode, and original video data corresponding to target video data is obtained through calculation according to an erasure algorithm, so that the read-write function is maintained, and the data processing efficiency is improved. After the video monitoring storage system enters the super-fault domain, damaged video data are reduced, undamaged video data can still be analyzed, and the availability of the video data is effectively improved.

The invention provides a hard disk testing method and electronic equipment, which can be applied to the technical field of hard disk testing. The hard disk testing method comprises the steps that a to-be-tested hard disk is operated under the condition that a plurality of physical fields are independently applied, a first operation parameter set is obtained, and the first operation parameter set comprises operation parameters and first testing parameter values of the operation parameters; according to a reference performance parameter set, multiple target parameters meeting preset conditions are determined from the first operation parameter set, and the reference performance parameter set is obtained by operating the to-be-tested hard disk in the environment without the physical field; superposing the physical fields corresponding to the plurality of target parameters to obtain a superposed physical field, and running the to-be-tested hard disk in the superposed physical field to obtain a second running parameter set; and determining a test result of the to-be-tested hard disk according to the second operation parameter set and the reference performance parameter set.

Provided are a computer program product, device, system, and method for write data management. In one embodiment, a write management controller calculates an order for writing data and parity blocks of write data code words on tape media in a variable interleaved fashion which ensures a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word. The calculated write order information may be provided back to a host or other data source so that the write data is eventually transmitted to the tape drive for writing on tape media in accordance with the calculated write order. In this manner, a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word may be achieved to increase the reliability of the data storage.

The invention relates to the field of fault detection, in particular to a disk array fault detection method and device. The method mainly comprises the steps of calculating a prior probability of a fault according to a failure rate of a circuit module; determining a target signal influencing a working state in the disk array, collecting an original sample of the target signal, obtaining a secondary sample under a fault condition in the original sample, and calculating an original conditional probability of the corresponding target signal according to the secondary sample; establishing a multi-factor model containing all target signals, and calculating a fault threshold value by using the multi-factor model based on the original conditional probability; and in the running process of the disk array, collecting alarm values of the target signals when the alarm signals are generated, forming alarm samples by the alarm values in a specified time period, calculating the posterior probability corresponding to each alarm sample, and judging the working state of the disk array in the corresponding time period according to the fault threshold and the posterior probability. According to the method, the false early warning rate can be reduced, and the RAID reliability and availability are improved.

A system for recalling data from tape is disclosed. The system includes computer processing circuits and computer readable storage media having computer executable instructions. When executed, the instructions cause the computer-processing circuits to start, in response to a request to recall data from a tape, to read the tape at a read position. Additionally, the instructions cause the circuits to determine that the tape comprises a damaged region. Further, the instructions cause the circuits to determine a start position of the damaged region by skimming the tape. Additionally, the instructions cause the circuits to determine an end position of the damaged region by skimming the tape. Further, the instructions cause the circuits to read between the read position and the start position of the damaged region. Additionally, the instructions cause the circuits to read between the end position of the damaged region and an end of data indicator.

To provide an information processor, a magnetic recording and playback device, and a magnetic recording and playback system capable of improving processing accuracy.SOLUTION: According to an embodiment, an information processor includes an acquisition part and a processing part. The acquisition part is capable of acquiring a playback signal based on a signal obtained from a magnetic recording medium. The playback signal includes first input data, second input data, and third input data. The processing part is capable of carrying out first processing and second processing. In the first processing, the processing part derives a first derived characteristic amount from a first inner product of a first characteristic amount based on the first input data and a second characteristic amount based on the second input data. In the second processing, the processing part derives a second derived characteristic amount from a second inner product of a third characteristic amount based on the third input data and the first derived characteristic amount.SELECTED DRAWING: Figure 1

According to one embodiment, a magnetic disk device includes a disk, a write head, a volatile buffer memory, a parity generation unit, a write processing unit, an error correction unit, a storage processing unit, and a conventional correction limit prediction unit. The parity generation unit generates first conventional parity, first potential parity, second conventional parity and second potential parity. The storage processing unit overwrites the second potential parity to a first recoding area if the first prediction information is normal information, and leaves the first potential parity in the first recording area and stores the second potential parity in a second recording area if the first prediction information is replaced with abnormal information.

Systems and methods for error detection in quantum computing systems are provided. In one example, the method includes obtaining a multi-dimensional quantum error detection map. The multi-dimensional quantum error detection map represents one or more quantum error detection measurements over a period of time. The method includes determining a partitioning scheme and a fusion scheme for the multi-dimensional quantum error detection map based at least in part on the decoding delay and the fusion delay. The method includes partitioning the multi-dimensional quantum error detection map into a plurality of blocks based at least in part on the partitioning scheme. The method includes decoding each of the plurality of blocks. The method includes fusing the plurality of blocks into a decoded detection map based at least in part on the fusion scheme. The method includes operating a quantum computing system based at least in part on the decoded detection map.

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

Provided in the present application are a magnetic recording medium, a positioning method, and a related device. The magnetic recording medium comprises a servo band and a positioning band, wherein the servo band is used for indicating longitudinal position information; and the positioning band is used for indicating physical position information, whch is used for indicating the real physical position of the longitudinal position information in the magnetic recording medium. In the magnetic recording medium, in addition to the existing servo band, a positioning band for indicating physical position information is additionally provided. The physical position information can indicate the real physical position of a certain point, and thus the position information of the magnetic recording medium at the logical level and the position information of the magnetic recording medium at the physical level are interconnected, facilitating physical-level processing on the magnetic recording medium by a user.

To provide an information processor, a magnetic recording reproduction device, and a magnetic recording reproduction system that can improve efficiency.SOLUTION: According to an embodiment, an information processor includes an acquisition part and a processing part. The processing part is configured to carry out first operation. The first operation includes first decoding, first accuracy evaluation, second decoding, and first determination operation. The first decoding includes processing a portion targeted for reproduction signal decoding by a first processing configuration to derive a first decoding result. When first accuracy of the first decoding result does not satisfy a first criterion, the second decoding includes processing the portion targeted for decoding by a second processing configuration to derive a second decoding result. The second processing configuration is at least partially different from the first processing configuration.SELECTED DRAWING: Figure 1

According to one embodiment, a nonvolatile memory includes a plurality of memory areas and controller circuit including an error correction code encoder. The error correction code encoder encodes a first data to generate a first parity in a first operation and encodes a second data to generate a second parity in a second operation. The controller circuit writes the first data and the first parity into a first memory area among the plurality of memory areas and writes the second data and the second parity into a second memory area among the plurality of memory areas. The size of the second data is smaller than the size of the first data and the size of the second parity is equal to the size of the first parity.

The technical scheme provides a data error correction and performance optimization method based on multiple optical disks, comprising the following steps: S1, generating a logical volume which is in a temporary data state before data recording and comprises a data block and a verification block; s2, converting the logical volume into a physical volume through a recombination algorithm, wherein the physical volume is a mirror image file which can be directly recorded to an optical disc; s3, respectively burning the physical volume to a plurality of corresponding optical disks, and synchronously mounting the optical disks through a plurality of CD drivers to realize concurrent read-write operation on the physical volume; and S4, when the data block in any optical disc is damaged, reversely calculating the position of the damaged data block in the logical volume through the recombination algorithm, calling undamaged data blocks and verification blocks corresponding to the damaged data block in other optical discs, and recovering the damaged data block based on an erasure code algorithm. According to the technical scheme, the reading performance of the large file can be optimized, and data protection can be provided.

Provided are a method, system, and computer program product in whichdata is encoded for a plurality of tracks of a tape of a tape drive, by using an error correction code (ECC) scheme that applies a single code with code word symbols that are at least 10 bits. The code word symbols are interleaved along and across parallel tracks of the tape in the tape drive.

The present disclosure relates to the technical field of computers, and discloses an audio testing method and device, electronic equipment and a storage medium. The method comprises obtaining first recording audio of each recording end and second recording audio of a playing end. The first recording audio and the second recording audio both comprise background audio played simultaneously, and the first recording audio further comprises test audio corresponding to the recording end one by one. Audio detection is performed on each first recording audio to obtain a starting time of the background audio in each first recording audio. Audio detection is performed on the second recording audio to obtain a starting time of the background audio in the second recording audio and a detection time of each test audio. Based on the starting time of the background audio in the second recording audio and the detection time of each test audio, and the starting time of the background audio in each first recording audio, a synchronous test result of the second recording audio is determined. The method objectively ensures the accuracy of the synchronous test result.

One aspect of an information processing device according to the present invention comprises: a hard disk drive; a processing device that accesses the hard disk drive; a plurality of fan devices that cool the processing device; and a control device that controls the plurality of fan devices. The control device acquires an error rate of the hard disk drive while changing the number of rotations of the plurality of fan devices under a condition in which the average air volume of the plurality of fan devices is a first air volume, and controls the number of rotations of the plurality of fan devices on the basis of a first combination which, among combinations of the number of rotations of the plurality of fan devices, makes the error rate equal to or less than a threshold value.

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 discloses a video damage repairing method, which comprises the following steps of: 1, acquiring three continuous frames of video images according to a time sequence, and estimating a second frame of reference image according to a first frame of video image and a third frame of video image; step 2, calculating a difference value between the second frame of video image and the second frame of reference image and obtaining a difference value image; step 3, carrying out binarization processing on the difference image to obtain a binarized image; step 4, performing connected domain marking on the binarized image, and abandoning areas with connected domain areas smaller than 10 to obtain a connected domain marked image; 5, judging whether a random damaged area appears in a certain frame or not by using the connected domain marked image; and for the found damaged area, using a corresponding pixel value in the image estimated in the step 1 as a restored pixel value. According to the invention, the problem that random patches appear in a video picture due to tape aging or tape damage of video data stored on a traditional tape can be effectively solved.

This invention provides a magnetic storage structure and a method for detecting interference based thereon. The magnetic storage structure includes a magnetic storage area, a non-magnetic storage area, and a verification circuit. The magnetic storage area comprises a main storage area and a monitoring storage area, with the monitoring storage area used to write initial monitoring data. The non-magnetic storage area includes a verification storage area, with the verification storage area used to write verification data. The verification circuit acquires the monitoring data currently stored in the monitoring storage area and uses the verification data to verify the monitoring data, thereby determining whether the initial monitoring data written to the monitoring storage area has been overwritten. Since the main storage area and the monitoring storage area, both being magnetic storage, have the same interference characteristics, the method infers whether the data stored in the main storage area has been overwritten by monitoring the data rewriting status of the monitoring storage area. This improves the accuracy of interference detection by detecting whether the data stored in the magnetic storage structure has been overwritten under harsh environments such as high temperature and high-intensity magnetic fields. The structure is simplified, and the cost is reduced.

The application provides a hard disk testing method and electronic equipment, which can be applied to the technical field of hard disk testing. The hard disk testing method comprises the following steps: running a to-be-tested hard disk under the condition that a plurality of physical fields are independently applied, to obtain a first running parameter set, wherein the first running parameter set comprises a running parameter and a first test parameter value of the running parameter; determining a plurality of target parameters that meet a predetermined condition from the first running parameter set according to a reference performance parameter set, wherein the reference performance parameter set is obtained by running the to-be-tested hard disk in an environment without a physical field; superimposing the physical fields corresponding to the plurality of target parameters respectively to obtain a superimposed physical field, and running the to-be-tested hard disk under the superimposed physical field to obtain a second running parameter set; and determining a test result of the to-be-tested hard disk according to the second running parameter set and the reference performance parameter set.

According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium including a plurality of concentric recording tracks, a magnetic head including a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium, and a controller including an inspection circuit which detects, based on an sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump.

According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium including a plurality of concentric recording tracks, a magnetic head including a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium, and a controller including an inspection circuit which detects, based on an sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump.

The application discloses a magnetic tape storage adaptive interleaving method and system based on dynamic error mode detection, relates to the technical field of magnetic tape interleaving, and comprises the following steps: continuously collecting error information in a magnetic tape reading and writing process and forming a structured report; judging the received structured report according to a preset rule, dynamically calculating new interleaving parameters, and outputting a decision package containing a new interleaving depth factor and a new available track list; checking whether the parameters in the received decision package are within a preset range, and if yes, sending an instruction to a magnetic tape drive through a bottom driver interface, setting new interleaving configuration for the magnetic tape, and obtaining a success status code returned by the magnetic tape drive; and the interleaving method significantly improves the reliability and error correction efficiency of the magnetic tape storage system in a complex error environment, reduces redundancy, and improves the effective utilization rate of storage space.

Data associated with a first set of managed flash storage devices of a cloud-based storage system is provided as an input to a machine learning model executed by a processing device that identifies one or more characteristics of the first set of managed flash storage devices from the data. A type of change associated with a second set of managed flash storage devices is determined by the machine learning model based on a comparison of the one or more characteristics of the first set of managed flash storage devices and one or more characteristics of the second set of managed flash storage devices. The type of change associated with the second set of managed flash storage devices is provided to a cloud services provider of the cloud-based storage system.

According to one embodiment, a nonvolatile memory includes a plurality of memory areas and controller circuit including an error correction code encoder. The error correction code encoder encodes a first data to generate a first parity in a first operation and encodes a second data to generate a second parity in a second operation. The controller circuit writes the first data and the first parity into a first memory area among the plurality of memory areas and writes the second data and the second parity into a second memory area among the plurality of memory areas. The size of the second data is smaller than the size of the first data and the size of the second parity is equal to the size of the first parity.