Abstract: One or more networks each include a plurality of sensor nodes operable to communicate public data with each other. Each of the plurality of sensor nodes is operable to gather sensor node data and store the sensor node data locally on the sensor node. Duplicate portions of the sensor node data are distributed to the public data of others of the plurality of sensor nodes via the public data paths for backup storage. The system includes a host that is coupled to individually communicate private data with each of the plurality of sensor nodes. Each of the sensor nodes protects the private data from others of the sensor nodes using distributed key management to ensure distributed encryption.

Abstract: A set of N network-coupled edge storage nodes are selected to store a file of size |F|. The N edge storage nodes have heterogeneous storage availability and are ordered from a largest storage availability at the first edge storage node to a smallest availability at the Nth edge storage node. A value Z<N is selected, such that an attacker having access to Z edge storage nodes is unable to decode any partial information of the file. The first through Z+1th edge storage nodes are assigned a same packet size. Keys are stored in the first Z edge storage nodes and independent linear combinations of the keys combined with partitions of the file are stored in the Z+1th to the Nth edge storage nodes.

Abstract: N storage nodes that are coupled via a network are selected to store a file of size |F| and redundancy of size |Fred|. A value Z<N is selected such that an attacker having access to Z storage nodes is unable to decode any partial information of the file. The file is divided into d partitions of size |PsN|, wherein |PsN| is a maximum factor of |F| subject to |PsN|?|sN|. Independent linear combinations hi's of the d partitions are created and random keys are generated and stored in the first Z of the N storage nodes. Independent linear combinations gi's of the random keys are created and combinations of the hi's and gi's are stored in the Z+1 to Nth storage nodes.

Abstract: Features are detected from a sensor signal via a deep-learning network or other feature engineering methods in an edge processing node. Machine-learned metadata is created that describes the features, and a hash is created with the machine-learned metadata. The sensor signal is stored as a content object at the edge processing node, the object being keyed with the hash at, the edge processing node.

Abstract: A first heat-assisted magnetic recording (HAMR) writer writes to a surface of a magnetic disk using during an initial time period. A second HAMR writer is configured to write to the surface but not during the initial time period. The initial time period extends from a first time when the disk drive is first used to a second time when a near-field transducer of the first HAMR writer reaches a first wear threshold. During a subsequent time period after the initial time period, to the surface of the disk is written to using the second HAMR writer and not the first HAMR writer.

Abstract: A digital sensor stream is received from a sensor. A domain transform is performed on the digital sensor stream to produce first and second substreams. The first substream is larger than the second substream. The first substream is stored in cold storage and the second substream is stored in a second storage that has faster access times than the cold storage. Deep machine learning is performed on the second substream, the results of which may be stored in the second storage.

Abstract: Systems and methods are disclosed for improving data channel design by applying transform domain analytics to more reliably extract user data from a signal. In certain embodiments, an apparatus may comprise a channel circuit configured to receive an analog signal at an input of the channel circuit, and sample the analog signal to obtain a set of signal samples. The channel circuit may further apply a filter configured to perform transform domain analysis to the set of signal samples to generate a first subset of samples, the first subset including fewer transitions and having a higher signal to noise ratio (SNR) than the set of signal samples. The channel circuit may detect first bit transform domain representation values from the first subset, and determine channel bit values encoded in the analog signal based on the set of signal samples and using the first bit transform domain representation values detected from the first subset as side information.

Abstract: A method includes partitioning a received data chunk into first and second data sectors to be stored in respective first and second store units. The method also includes generating first and second random keys. The method further includes encrypting the first data sector with the second random key, and encrypting the second data sector with the first random key. The first and second random keys are encoded with channel codes. Thereafter, the first encoded random key is appended to the first encrypted data sector to obtain first appended data, and the second encoded random key is appended to the second encrypted data sector to obtain second appended data.

Abstract: A data storage device includes a data storage medium having a data storage surface. The data storage device also includes a first actuator having a first attached slider with a writer configured to write data on the data storage surface. The writer has a media-confronting surface covered by a first non-magnetic overcoat having a first thickness. The data storage device further includes a second actuator having a second attached slider with at least one user-data reader configured to read user data from the data storage surface and no writer for writing data on the data storage surface. The at least one user-data reader has a media-confronting surface covered by a second non-magnetic overcoat having a second thickness that is less than the first thickness of the first non-magnetic overcoat.

Abstract: Two or more video signals from two or more sensors are received and discrete wavelet transformations are performed on the two or more video signals. Temporally stationary and non-stationary background data is determined from the discrete wavelet transformations. Redundancies are determined using the temporally stationary background data, the redundancies indicating an overlap between the two or more video signals Data of the two or more video signals is stored without the redundancies to reduce a storage size.

Abstract: Two or more video signals are received at respective two or more peer-level storage nodes. Discrete wavelet transformations are performed on the two or more video signals via the two or more peer-level storage nodes. Temporally stationary background data is determined from the discrete wavelet transformations at each of the two or more peer-level storage nodes. Redundancies are determined using the temporally stationary background data, the redundancies indicating an overlap between the two or more video signals. A storage size of two or more video signals is reduced by not storing the redundancies on at least one of the peer-level storage nodes.

Abstract: Two or more video signals are received at respective two or more peer-level storage nodes. Discrete wavelet transformations are performed on the two or more video signals via the two or more peer-level storage nodes. Temporally stationary background data is determined from the discrete wavelet transformations at each of the two or more peer-level storage nodes. Redundancies are determined using the temporally stationary background data, the redundancies indicating an overlap between the two or more video signals. A storage size of two or more video signals is reduced by not storing the redundancies on at least one of the peer-level storage nodes.

Abstract: One or more networks each include a plurality of sensor nodes operable to communicate public data with each other. Each of the plurality of sensor nodes is operable to gather sensor node data and store the sensor node data locally on the sensor node. Duplicate portions of the sensor node data are distributed to the public data of others of the plurality of sensor nodes via the public data paths for backup storage. The system includes a host that is coupled to individually communicate private data with each of the plurality of sensor nodes. Each of the sensor nodes protects the private data from others of the sensor nodes using distributed key management to ensure distributed encryption.

Abstract: First tracks are read via a first head that is moved via a first actuator over a first, radially-defined, zone of a disk surface. Second tracks are read via a second head that is moved via a second actuator over a second zone of the disk surface that is separate from the first zone. The first and second heads are optimized to read data within first and second skew angle ranges associated with the first and second zones. The first and second skew angle ranges are each less than a total skew angle range of the disk surface.

Abstract: Bottom tracks are written to a recording medium using a first setting of a spin-torque oscillator of a single microwave assisted magnetic recording (MAMR) head. Top tracks are written interlaced between and partially overlapping the bottom tracks using the single MAMR head at a second setting of the MAMR head, the first and second settings resulting in different bit aspect ratios for the top and bottom tracks.

Abstract: First and second tracks are read simultaneously via a first reader mounted in a head-gimbal assembly. The first reader provides a first signal based on detecting a total perpendicular field of the first and second tracks. The first and second tracks are read simultaneously via a second reader mounted in the head-gimbal assembly. The second reader provides a second signal based on detecting a total longitudinal field of the first and second tracks. At least one of a position error and a timing error of at least one of the first and second readers are determined based on user data read via the respective first and second signals.

Abstract: A set of patterns written to a magnetic recording medium are found that result in a relatively high and/or low error when read back. Upon writing subsequent to the determining of the set of patterns, one pattern of the set of the patterns is identified within a data segment ready to be written to the magnetic recording medium. The data segment is written with a changed bit spacing in response to identifying that the one pattern of the set of the patterns is within the data segment.

Abstract: A recording head has a first magnetic writer and a second magnetic writer offset from the first magnetic writer in a downtrack and crosstrack direction. The recording head has leads configured to deliver respective first and second write and/or laser currents to the first and second writers. The first and second write and/or laser currents enable the first and second writers to simultaneously write to adjacent tracks of a magnetic disk.

Abstract: A first set of bottom tracks is written via a first head that is moved via a first actuator over a surface of a disk. A second set of top tracks interlaced between and partially overlapping the bottom tracks via a second head that is moved via a second actuator over the surface of the disk independently of the first actuator and first head.

Abstract: Bottom tracks are written to a recording medium using a first setting of a microwave assisted magnetic recording (MAMR) head. Top tracks are interlaced between and partially overlapping the bottom tracks using a second setting of the MAMR head, the second setting resulting in a narrower track width than the first setting.