Abstract: The technology disclosed herein provides a method for generating an on-cylinder limit (OCLIM), the method including performing servo certification of a plurality of drives in a storage device to generate servo adaptive parameters (SAPs) by heads, generating a plurality of read adjust parameters (RAPs) by heads for the plurality of drives, generating an interim OCLIM value based on the SAPs by heads and RAPs by zones, and operating a disc drive write element using the interim OCLIM value.

Abstract: A recording head includes a nanorod configured to heat a hotspot on a recording media, a plasmonic plate configured to concentrate an electric field to excite the nanorod, and a heat sink configured to dissipate heat from the nanorod. The recording head includes a first diffusion barrier plate configured to resist diffusion of materials between the plasmonic plate and the nanorod and a second diffusion barrier plate configured to resist diffusion of materials between the heat sink and the nanorod. The first diffusion barrier plate is disposed between the nanorod and the plasmonic plate and is coupled to a bottom surface of the nanorod. The second diffusion barrier plate is disposed between the heat sink and the nanorod and is coupled to the top surface of the nanorod.

Abstract: A tape drive for use with a magnetic tape including two spaced apart servo tracks and a first data track includes a tape head, an actuator assembly, and a controller. The tape head includes two spaced apart servo elements that are each configured to read one of the two servo tracks, and a first read/write element that is configured to one of read data from and write data to the first data track. The tape head is positionable at a base head rotation angle relative to transverse to the length of the magnetic tape. The actuator assembly is configured to selectively rotate the tape head relative to the magnetic tape. The controller controls the actuator assembly to selectively rotate the tape head relative to the magnetic tape from the base head rotation angle to an adjusted head rotation angle that is different than the base head rotation angle based solely on servo information from the two servo elements reading the two servo tracks.

Abstract: According to one embodiment, a magnetic disk includes a disk, first and second heads which write data to the disk and read data from the disk, a first actuator includes the first head, a second actuator includes the second head, first and second controllers which control the first head, the second head, the first actuator and the second actuator, an auxiliary power supply which supplies power when power from a power supply is shut off, and a power supply detection unit which makes power supplied from the auxiliary power supply to the first controller higher than the power supplied from the auxiliary power supply to the second controller when shutoff of power from the power supply is detected.

Abstract: The invention discloses a holographic multiplex recording method, which combines technical advantages of angle multiplexing and shift multiplexing, and improves capacity and stability of a system. A medium contracts and expands due to environmental temperature fluctuations, which causes broken Bragg condition. However, the angle multiplexing has the advantages that the broken Bragg condition caused by contraction and expansion of the medium can be corrected by controlling an incident angle of a reference beam and an emitting wavelength of a laser, and the problem of a weak reproduction signal caused by the environmental temperature fluctuations is solved. On the other hand, the advantages of shift multiplex recording are that cross-write noise is not accumulated and that a multiplexing number can be improved by using a cross-shift multiplex method. According to the present invention, a large-capacity recording device with high stability is realized by combining the two technologies.

Abstract: Technology for improved data detection using machine learning may include a method in which an analog read signal comprising data read from a non-transitory storage medium of the data storage device is received. The analog read signal is processed into a plurality of digital samples. A digital sample from the plurality of digital samples is classified into a category from a plurality of categories using a machine learning algorithm for at least some of the plurality of digital samples. The plurality of digital samples is then decoded based on at least some of the predicted categories.

Abstract: In one aspect, a data storage device includes a disc, an arm, a head, a linear driver, and an elevator. The disc has a read/write surface defining an x-y plane. The arm has a head end that is movable relative to the disc. The head is configured to interact with the read/write surface. The linear driver is configured to move the arm along a substantially straight line in the x-y plane. The elevator is configured to move the arm in a z direction. In another aspect, rather than a linear driver, the data storage device includes a rotary actuator and a pivot actuator. The arm includes a first portion and a load beam. The rotary actuator is configured to move the first portion about a first pivot axis; the pivot actuator is configured to move the load beam about a second pivot axis relative to the first portion.

Abstract: Systems and methods are disclosed for dynamically adjusting parameters used during a read operation to reduce stress on a read head. In certain embodiments, an apparatus may comprise a read head configured to read data stored to a data storage medium, and a control circuit that controls a parameter of the read head influencing the read head's ability to accurately read data. The control circuit may be configured to extend the working lifespan of the read head by monitoring a read performance of the read head, and adjusting the parameter to reduce the read performance when the read performance is greater than a first threshold.

Abstract: According to a positioning method for a hologram in a disk-type holographic storage medium, a guide groove is formed in advance in the disk-type storage medium and is scribed with a positioning marker that includes index information, position information and crossing angle information. The positions of a positioning laser beam and a recording/reproducing laser beam are applied to the same medium position. When an optical head accesses a recording/reading position at a high speed, the shift multiplex recording/reading is performed starting from a marker position. A servo system controls the laser beams to move along the guide groove and ensures that a focused beam is focused on the medium. According to the method, the position and angular information can be quickly positioned in process of performing cross-shift multiplex recording/reading, the recording/reading speed of the system is improved, and random access is achieved.

Abstract: A tape cartridge for use in one or more tape drives of a tape library includes a cartridge housing and a magnetic tape. The magnetic tape is retained within the cartridge housing. The magnetic tape includes a first tape section that is pre-recorded with calibrated data for evaluating data durability on the magnetic tape. The magnetic tape is usable within the tape library to measure a health of the one or more tape drives and/or confirm a suitability of an operating environment within the tape library in terms of at least one of temperature and humidity. The calibrated data in the first tape section can be further configured for evaluating total transverse dimensional stability on the magnetic tape. The first tape section can include predetermined error patterns to assist in evaluating the data durability on the magnetic tape and/or periodic tape scrubbing operations to enhance data durability on the magnetic tape.

Abstract: A data storage device includes a primary storage media, a drive storage controller electrically coupled to media recording electronics and a controller-override mechanism. The controller-override mechanism is selectively controllable by a user to override control actions of the drive storage controller to prevent the drive storage controller from altering the primary storage media at a time when the storage device is otherwise configured for nominal data storage operations.

Abstract: The invention relates to a positioning method and device for a hologram in a card-type holographic storage medium, which can be used for beam positioning of cross-shift multiplexing and belong to the technical field of optical holographic storage. A guide groove in a grid shape is engraved on a card-type storage medium, and is provided with positioning markers. Each marker includes position information and direction information, can control an optical head to move along the guide groove, and shift multiplexing/reproducing is performed when recognizing the positioning markers. Since the card-type medium is adopted, a 90-degree rotation can be executed three times, and a total of four times of shift multiplex recording is performed. Random access can be achieved even in a medium that is rotated and used by adopting the positioning method and device described in the present invention.

Abstract: A computing device with a touch screen display simultaneously displays on the touch screen display a plurality of user interface objects and at least one destination object. The computing device detects a first input by a user on a destination object displayed on the touch screen display. While continuing to detect the first input by the user on the destination object, the computing device detects a second input by the user on a first user interface object displayed on the touch screen display. In response to detecting the second input by the user on the first user interface object, the computing device performs an action on the first user interface object. The action is associated with the destination object.

Abstract: In an approach, a processor determines that an inactive data area is present at end-of-tape (EOT) of a tape. A processor, responsive to determining that the inactive data area is present at EOT, securely erases the inactive data area that is present at EOT by overwriting data located at the inactive data area with different data.

Abstract: According to one embodiment, a magnetic disk device includes a disk, a head that writes data to the disk and reads data from the disk, and a controller that executes error correction on a first sector which is unreadable in a first track from an initial reading time of initially one-round reading the first track of the disk based on first parity data corresponding to the first track.

Abstract: A reproduction apparatus dividing a cross section of superposed light into a plurality of regions in a tangential and/or radial direction includes: an optical system configured to generate each of a first set of signal light and reference light having a phase difference of approximately 0°, a second set of signal light and reference light having a phase difference of approximately 180°, a third set of signal light and reference light having a phase difference of approximately 90°, and a fourth set of signal light and reference light having a phase difference of approximately 270°, using a plurality of superposed light beams corresponding to the divided regions; an optical receiver configured to output signals corresponding to the sets of the signal light and the reference light; and a circuit configured to compute signals as differences between the signals, and obtain a reproduction signal by computation from the computed signals.

Abstract: A storage array includes a plurality of hard disks, each of the hard disks is divided into a plurality of chunks, and a plurality of chunks of different hard disks form a chunk group by using a redundancy algorithm. The storage array obtains fault information of a faulty area in a first hard disk, and determines a faulty chunk storing the lost data according to the fault information. The storage array recovers the data in the faulty chunk by using another chunk in a chunk group to which the faulty chunk belongs and stores the recovered data in a recovered chunk. The recovered chunk is located in a second hard disk which is not a hard disk for forming the chunk group.

Abstract: In an approach to automatically reconciling data in HSM without affecting system performance, responsive to migrating a file on a hierarchical storage system from a primary storage to one or more tape drives, one or more file migration records are recorded in a reconcile database. Responsive to the occurrence of a file event on the primary storage, the one or more file migration records in the reconcile database are updated. Responsive to receiving a command to unmount a first mounted tape on one of the one or more tape drives, a reconcile function is performed on the first mounted tape, wherein the reconcile function updates the first mounted tape with the one or more file migration records in the reconcile database.

Abstract: Long term optical memory includes a storage medium composed from an array of silicon nanoridges positioned onto the fused silica glass. The array has first and second polarization contrast corresponding to different phase of silicon. The first polarization contrast results from amorphous phase of silicon and the second polarization contrast results from crystalline phase of silicon. The first and second polarization states are spatially distributed over plurality of localized data areas of the storage medium.

Abstract: The present invention relates to a holographic storage device and method for simultaneously recording and reading on two sides, and pertains to the technical field of optical holographic storage. The device and method disclosed in the present invention use a characteristic that orthogonal light would not interfere with each other and a Bragg selectivity characteristic for holographic storage, and use two optical heads to constitute two interference fields orthogonal in polarization directions on two sides of a same position of a holographic storage medium, so as to perform two-path simultaneous recording and reading on a hologram. The device and method provided in the present invention implement two-path parallel recording and reading of holographic storage, and combine shift multiplexing and circumferential rotation multiplexing, thereby improving the speed of an information data recording and reading process while increasing a capacity of the holographic storage.