The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent, wherein the ferromagnetic powder is selected from the group consisting of hexagonal strontium ferrite powder and ε-iron oxide powder, and has an average particle size of 5 nm or more and 20 nm or less, wherein the magnetic layer has a servo pattern, and wherein an average area Sdc of magnetic clusters of the magnetic recording medium in a DC demagnetization state, measured by a magnetic force microscope is 0.2×10.sup.4 nm.sup.2 or more and less than 5.0×10.sup.4 nm.sup.2.

To provide a servo signal verifying device for verifying a servo signal of a magnetic recording tape with high recording density. The present technology provides a servo signal verifying device including: at least one servo signal reading head that reads a servo signal written to a servo band of a magnetic recording tape; a first amplifier that amplifies the servo signal read by the servo signal reading head; and a second amplifier that includes a low-pass filter with a cutoff frequency of 35 MHz or less and amplifies a signal amplified by the first amplifier. Further, the present technology provides also a servo writer that includes the servo signal verifying device, and a method of producing a magnetic recording tape using the servo signal verifying device. Further, the present technology provides also a servo signal reading head constituting the servo signal verifying device.

There is provided a magnetic recording medium of which a dimensional change due to a change in a temperature/humidity environment is small. The magnetic recording medium is a magnetic recording medium having a tape-like shape and having an average thickness of 5.3 μm or less. The magnetic recording medium includes a substrate and a magnetic layer provided on the substrate. An environmental relative humidity, in which a temperature expansion coefficient of the magnetic recording medium is 6.0 ppm/° C. or more and 8.0 ppm/° C. or less, ranges between 10% RH and 80% RH.

The present disclosure generally relates to a tape drive including a tape head. The tape head comprises two modules, where each module comprises 64 writers, 64 readers, and three pairs of servo readers aligned with the 64 readers in a first row. The three pairs of servo readers comprise a first pair disposed at a first end of the first row, a second pair disposed between two groups of 32 readers, and a third pair disposed at a second end of the first row. The writers are disposed in a second row parallel to the first row, and are each aligned with an adjacent reader. The spacing between each reader and each writer is about 150 m to about 200 m. Each module is configured to write data to a tape using the 64 writers and to read verify the newly written data using the 64 readers.

An apparatus, according to one embodiment, includes a module having an array of transducers, and at least two expansion elements positioned proximate the array of transducers. The expansion elements are arranged side by side along a line extending parallel to a longitudinal axis of the array of transducers, wherein the array of transducers includes at least three servo readers. A controller is electrically coupled to the expansion elements, and is configured to individually control an extent of expansion of each expansion element based on feedback from the servo readers.

A data storage device is disclosed comprising a coarse actuator configured to actuate a first head over a first disk surface and a second head over a second disk surface. A first fine actuator is configured to actuate the first head over the first disk surface, and a second fine actuator is configured to actuate the second head over the second disk surface. A first bias signal is calibrated for the first fine actuator, and a second bias signal is calibrated for the second fine actuator. The first fine actuator is controlled based on the first bias signal and the second fine actuator is controlled based on the second bias signal in order to concurrently access the first disk surface and the second disk surface.

A tape drive may calculate a slope for each of the timing-based-servo marks in a timing-based-servo group. The timing-based-servo marks are arranged in one or more M-patterns. The tape drive may average the slope for each of the timing-based-servo marks across the one or more M-patterns. The tape drive may generate a least-squares assessment of the averaged slope. The tape drive may determine, from the least-squares assessment, whether the averaged slope is demonstrative of tape-creep.

A computer program product for writing a servo track includes a computer readable storage medium having program instructions embodied therewith. The program instructions are executable by a computer. The program instructions cause the computer to monitor a lateral position of a magnetic tape passing over a servo writing head during a servo track writing operation and write servo marks to the magnetic tape. A timing of the writing of each mark is based on the monitored position of the magnetic tape. A computer program product for writing a servo track includes a computer readable storage medium having program instructions embodied therewith. The program instructions are executable by a computer. The program instructions cause the computer to optically monitor a lateral position of a magnetic tape passing over a servo writing head during a servo track writing operation.

A tape drive-implemented method, according to one embodiment, includes: using information read from one or more servo bands on a magnetic tape to position a magnetic tape head relative to the magnetic tape. An array of data transducers is positioned along the magnetic tape head, the array extending perpendicular to a direction of travel of the magnetic tape. Moreover, a group of servo readers is positioned at each end of the array of data transducers. A distance between each of the immediately adjacent servo readers in each of the groups of servo readers is less than or equal to one third of a prespecified width of each of the servo bands. Furthermore, the distance between each of the servo readers in each of the groups and the prespecified width are both measured in a direction perpendicular to the direction of travel of the magnetic tape.

The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent, wherein the ferromagnetic powder is selected from the group consisting of hexagonal strontium ferrite powder and s-iron oxide powder, and has an average particle size of 5 nm or more and 20 nm or less, wherein the magnetic layer has a servo pattern, and wherein an average area Sdc of magnetic clusters of the magnetic recording medium in a DC demagnetization state, measured by a magnetic force microscope is 0.210.sup.4 nm.sup.2 or more and less than 5.010.sup.4 nm.sup.2.