Read and write transducer elements have very high reliability for most of their respective lives. Only a small percentage of transducer elements fail after a significant duration of operation in the field, but failure rate ramps up significantly with as the transducer elements age, particularly with heavy read and write use. Prior solutions to this problem involve regularly running data field integrity checks. However, the data field integrity checks are resource intensive and yield significant latency impacts. The presently disclosed technology renders data field integrity checks (that come with high latency costs) dependent upon periodic or continuous head health monitoring schemes (that come with low latency costs). The data field integrity checks are triggered by a poor health signal generating from the head health monitoring schemes rather than being continuously or periodically performed with no regard to projected head health.

Example servo interface circuitry, data storage devices, and methods to provide parallel self-servo write in a data storage device are described. The data storage device may include servo control circuitry that includes at least three digital-analog converters to provide control signals to the voice control motor (VCM) and arm actuators (e.g., micro actuators and milli actuators) of the data storage device. In data read/write mode, one actuator control signal controls the milli actuator for the target arm/head and another actuator control signal controls the micro actuator for the target arm/head. In self-servo write mode, one actuator control signal controls the micro actuator for one target arm/head and the other actuator control signal controls the micro actuator for another target arm/head for parallel self-servo writing.

The present disclosure generally relates to a tape drive comprising one or more tape head modules. Each tape head module comprises 65 data elements disposed in a first row, each data element being a write element or a read element, and at least 5 servo element pairs disposed in a second row, the second row being disposed parallel to the first row. The second row is spaced a distance in a first direction from the first row. One or more data elements and one or more servo element pairs may be unwired and non-operable. The tape drive may comprise three tape head modules, where the second tape head module is disposed between the first and third tape head modules. Each data element of the first tape head module and the third tape head module are write elements, and each data element of the second module is a read element.

The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A protruding peak height Spk specified in ISO 25178 on a surface of the magnetic layer is 1.5 nm or more and 3.0 nm or less, and standard deviation of the Spk in a width direction of the surface of the magnetic layer is 0.5 nm or less.

A disk device according to one embodiment includes a base, a first cover, a second cover, and a damper. The base includes a bottom surface, a side wall protruding in a first direction from the bottom surface, and a support surface located at an end of the side wall in the first direction. The first cover is attached to the base to close the inner space. The second cover is joined to the base while being supported by the support surface, to cover the first cover. The damper includes a constrained layer in-between the first cover and the second cover and a viscoelastic material between the first cover and the constrained layer. The constrained layer includes a smaller-thickness part extending along the support surface and a larger-thickness part connected to the smaller-thickness part.

A noncontact communication medium performs communication with an external device in a noncontact manner. The noncontact communication medium includes a resonance circuit, a regulator that generates operating power, a variable resistor, a switcher, and a control circuit. The processing circuit generates a response signal corresponding to a command signal. The switcher switches between an applied state in which a load of the variable resistor is applied to the resonance circuit and a non-applied state in which the load is not applied to the resonance circuit, according to the response signal. The control circuit controls the resistance value according to the bleed power dissipated from the regulator.

According to one embodiment, a magnetic disk device includes a disk, a write head, a write processing unit selecting a shingled magnetic recording, a determination unit, and a refresh processing unit. The determination unit determines whether a quality-degraded recording sector exists in all recording sectors in each of the bands. If it is determined that a target band including the quality-degraded recording sector exists in the bands, the refresh processing unit refreshes target recording sectors. The target recording sectors include the quality-degraded recording sector. In the target band, the number of the target recording sectors is less than the number of all recording sectors.

According to one embodiment, a magnetic disk device includes a disk, a write head, a write processing unit selecting a shingled magnetic recording, a determination unit, and a refresh processing unit. The determination unit determines whether a quality-degraded recording sector exists in all recording sectors in each of the bands. If it is determined that a target band including the quality-degraded recording sector exists in the bands, the refresh processing unit refreshes target recording sectors. The target recording sectors include the quality-degraded recording sector. In the target band, the number of the target recording sectors is less than the number of all recording sectors.

A head driving device includes an actuator assembly driving a head member in a width direction of tape. The head driving device includes a first end support beam, a second end support beam, a first skew driving piezoelectric unit, and a second skew driving piezoelectric unit. The first end support beam is arranged between a first end portion of the head member in a length direction and a base member. The second end support beam is arranged between a second end portion of the head member in the length direction and the base member. The first skew driving piezoelectric unit and the second skew driving piezoelectric unit drive the head member around the Z-axis.

A hard disk drive includes multiple disk media mounted on a spindle, where the outer diameter of each disk medium is offset from the inner diameter of the disk medium in a same direction along an axis of rotation of the spindle, and a load/unload ramp positioned, based on the offset, to align in correspondence with the outer diameters of the disk media. Thus, the curvature of irregular disk media, such as that associated with thinner and thinner disks, is mitigated by grouping similarly-characterized irregular disks together on a given spindle and compensating the ramp accordingly.