111results about "Digital signal error detection/correction" patented technology

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.

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.

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.

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.

A turbo encoder intended for use in earth stations communicating through data networks where Successive Interference Cancellation ( S IC ) multiple access to Low Earth Orbit ( LEO ) satellites is employed. The disclosed turbo encoder constitutes an enhancement to code rate 1 / 8 of a known in the art code rate 1 / 6 turbo encoder that comprises two recursive convolutional encoders, an encoder a and an encoder b. The enhancement is achieved by adding two recursive convolutional encoder forward connection vectors to the code rate 1 / 6 turbo encoder as follows : adding forward connection vector G4 10111 to either encoder a or encoder b; and adding forward connection vector G2 10101 to encoder b.

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.

Techniques are provided for an error resistant radiation hardened memory system based on spreading of data bits among multiple random access memories (RAMs). A memory system implementing the techniques according to an embodiment includes a first plurality of RAMs configured to store data bits written to the memory system, the data bits distributed over the first plurality of RAMs. The system also includes an error correction coding (ECC) circuit configured to generate ECC codes, each of the codes associated with a unique group of the data bits. The system further includes a second plurality of RAMs configured to store bits of the ECC codes such that the bits of each ECC code are distributed over the second plurality of RAMs. The system further includes a reporting circuit configured to report a single bit error correction or a double bit error detection, resulting from a read operation on the memory system.

The optical disk device of the present disclosure is characterized in that a signal obtained by extracting an adjacent track component from a playback signal of a target track is generated and phase error is detected from mutual correlation with a playback signal of the adjacent track, whereby resampling is performed so that the playback signal of the target track and the playback signal of the adjacent track take on adjacent signal waveforms at the same angular position.

To provide a magnetic reproducing processing device, a magnetic recording / reproducing device, and a magnetic reproducing method capable of suppressing errors.SOLUTION: According to an embodiment, a magnetic reproducing processing device includes a decoder. The decoder includes a convolution layer including a plurality of filters and an attention layer capable of deriving a degree of contribution regarding the plurality of filters. The decoder can output a decoding result obtained by integrating the result of processing the input signal with the plurality of filters according to the degree of contribution.SELECTED DRAWING: Figure 1

A method according to one embodiment includes acquiring a result of quality inspection related to recording quality of first sectors included in a first storage area of a magnetic disk. The method includes calculating a first number being the number of sectors corresponding to a capacity obtained by subtracting a set capacity from an actual capacity of the first storage area. The first number is calculated based on the set capacity of the first storage area and a set value of recording density of the first storage area. The method includes selecting a second number of sectors from the first sectors based on the result of quality inspection. The method includes assigning addresses to a group of sectors that are not included in the second number of sectors among the first sectors. The group of sectors consists of sectors with the number corresponding to the set capacity.

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.

A method for decoding includes, in a decoder 20 of an error correction code (ECC), receiving, in a buffer 24, a codeword 50 of the ECC containing a plurality of symbols, the codeword being misaligned with one or both boundaries of the buffer. In the buffer, one or more bits that do not belong to the codeword are zeroed. One or more syndromes are computed for the codeword across both the codeword and the zeroed bits. Based on the calculated syndromes, locations of one or more erroneous symbols are identified in the codeword, and the erroneous symbols are corrected in the identified locations to restore an erroneous version of the codeword. The method further includes compensating for misalignment between the codeword and the buffer during calculation of the syndrome or during identification of the location of the erroneous symbol.

A method comprises receiving data. The method comprises determining redundancy data for the received data. The method comprises storing the received data and the redundancy data in one or more memory modules of a group of memory modules. The method comprises receiving a read data request. The method comprises reconstructing the requested data, based on an erase data operation preventing a read data operation on the one or more memory modules where the requested data is stored. A time delay to reconstruct the requested data is less than a time period where a memory module of the group of memory modules is in an erase state.