An apparatus includes a top section, a middle section, and a bottom section of a spring actuator for a tape drive that form a C-shape of the spring actuator. The middle section includes three flexor columns, where a first writer module is bonded to a first flexor column from the three flexor columns, a reader module is bonded to a second flexor column from the three flexor columns, and a second writer module is bonded to a third flexor column from the three flexor columns.

A digital filter completes a portion of digital filter operations performed on a control signal before the control signal has been determined. Calculation delay associated with performing digital filter operations on the control signal can be reduced and stability of the servo control system improved. For a particular servo wedge of a storage disk, an estimated control signal is used to determine a pre-computed first output of a digital filter before an actual control signal for that particular servo wedge has been determined. Then, once the actual control signal for the servo wedge has been determined, an implemented second output of the digital filter is determined based on the pre-computed first output and a difference between the estimated control signal and the actual control signal. The implemented second output of the digital filter is used to control magnetic head position in response to crossing the servo wedge.

Disclosed are hard disk drives (HDDs), and methods for use therewith, that utilize reduced overhead servo fields, thereby simplifying the servo system. Reduced overhead servo fields may be of particular use in HDDs that utilize multi-revolution storage techniques to store data at much higher densities than what is possible for conventional HDDs. The relaxed performance requirements of high-density, multi-revolution drives provides opportunities for reducing servo overhead, thereby potentially further increasing the areal density capability of the magnetic media. Servo overhead may also be reduced by placing certain servo data on flash or other memory off of the media disk rather than in the servo fields written to the media disk.

Disclosed are hard disk drives (HDDs), and methods for use therewith, that utilize reduced overhead servo fields, thereby simplifying the servo system. Reduced overhead servo fields may be of particular use in HDDs that utilize multi-revolution storage techniques to store data at much higher densities than what is possible for conventional HDDs. The relaxed performance requirements of high-density, multi-revolution drives provides opportunities for reducing servo overhead, thereby potentially further increasing the areal density capability of the magnetic media. Servo overhead may also be reduced by placing certain servo data on flash or other memory off of the media disk rather than in the servo fields written to the media disk.

A tape drive device includes a head member, a tape drive mechanism moving a tape, a suspension member supporting the head member, piezoelectric units, a drive voltage supply circuit applying a voltage to a piezoelectric element, and a controller. Each of the piezoelectric units includes a piezoelectric element. The controller determines a state of a head unit, based on a piezoelectric output generated at the piezoelectric element provided in the suspension member.

According to one embodiment, there is provided a method of manufacturing a disk device. The method includes acquiring information on a write width of a head. The method includes adjusting a seek speed of the head at a time of writing a spiral pattern to a disk according to the acquired write width.

A tape head adapted to 32-, 64-, and 128-channel operation is provided. A plurality of elements is provided, numbering N.sub.E, comprising first and second sets of 64 evenly-spaced elements, each set comprising at least a first element and a last element. A plurality of servos is provided, comprising at least a first through sixth servo. The 64 evenly-spaced elements of each set are separated by an element pitch (W.sub.EP). The evenly-spaced elements and plurality of servos are spaced as set forth herein.

A voice coil motor assembly (VCMA), such as for a hard disk drive, includes a low-density voice coil and a high-density coil stiffener disposed inside the coil of wire. The low-density voice coil, utilizing copper-clad aluminum or aluminum wire, is configured to increase the second coil torsion mode frequency of the VCMA, thereby bringing it closer to the second torsion mode frequency of the actuator arms. In conjunction, the high-density stiffener, utilizing steel or copper or zinc, is configured to increase the mass of the VCMA to compensate for the lower-density wire in regard to the center of mass of the VCMA about its axis of rotation. In viewing under customer box vibration conditions and in terms of position error signals (PES), a non-trivial peak in the PES spectrum due to the second coil torsion mode is largely eliminated, and the power of PES is reduced to about half.

A head driving device moving a head member relative to tape as a recording medium. The head driving device includes a base member including a first frame portion and a second frame portion, and a head supporting member supporting the head member. A first end support beam is arranged between a first end portion of the head member in a length direction and the base member, and a first skew driving piezoelectric unit including piezoelectric elements for driving the head member is arranged in the first end support beam.

According to one embodiment, a magnetic disk device comprises a first actuator which displaces magnetic heads in a radial direction of the magnetic disks, second actuators which displace the magnetic heads in a direction along the radial direction of the magnetic disks independently from each other, third actuators which displace the magnetic heads in directions opposite to each other along the radial direction of the magnetic disks by a same amount at a same time, and a controller which controls driving of the first actuator, driving of the second actuators and driving of the third actuators.