According to one embodiment, there is provided a hard disk drive including a first recording surface, a second recording surface, a first magnetic head, a first actuator and a second actuator that move the first magnetic head, a second magnetic head, a third actuator and a fourth actuator that move the second magnetic head, a fifth actuator that moves the second actuator and the fourth actuator, a drive circuit that implements at least one of a first mode in which the second actuator and the fourth actuator operate differently from each other or a second mode in which the first and third actuators operate differently from each other, and a controller that controls the drive circuit.

A disk-drive suspension includes a load beam, a flexure laid on top of the load beam, a first terminal provided on the flexure, and a first bump arranged on a top surface of the first terminal. The first terminal includes a narrow part having a first width in a first direction and including a center of the first terminal, and a wide part having a second width in the first direction greater than the first width. The wide part and the narrow part are arranged in a second direction intersecting the first direction. The first bump has, at the center, a first height from a bottom surface of the first terminal. The first height is greater than the first width.

A system and methods for manufacturing devices such as flexures using process coupons are described are described. The method including performing a test on at least one feature of a coupon, the coupon is included on an assembly sheet used in manufacturing flexures. The at least one feature is produced by a manufacturing processing step that is used to produce a portion of a flexure. And, the physical characteristics of the feature include at least one physical characteristic that is different than physical characteristics of the portion. The method also including determining the manufacturing processing step will produce an abnormal portion of a flexure based on the performed test. Further, the method includes adjusting the manufacturing processing step and manufacturing a portion of a flexure using the adjusted manufacturing processing step.

A suspension is described. The suspension includes a base plate and a load beam coupled to the base plate. The base plate includes a distal elongated element and a proximal elongated element. The distal elongated element includes at least one non-straight baseplate edge and the proximal elongated element includes at least one non-straight baseplate edge. The load beam includes a first mounting shelf and a second mounting shelf. The load beam is coupled to the base plate such that the first mounting shelf is exposed adjacent to the distal elongated element, and the second mounting shelf is exposed adjacent to the proximal elongated element. The first and second mounting shelves are configured to receive an actuator, such that an edge of the actuator and the at least one non-straight baseplate edge forms a gap.

A gimbal assembly includes a frame having base, tip and mount portions, and a crossbar joined to the tip portion by a neck region. Portions of the crossbar and neck region define transition edge regions each extending from a point of minimum width D of the neck region to where the edge of the crossbar becomes substantially straight. Each of the transition edge regions includes a transition length a and a transition width b. The frame comprises an area of interest that includes the neck region and a portion of the crossbar that has a length of 0.6 mm and is centered to the neck region, and has a total area size A, a centroid C and a centroid distance H between the centroid C and a far side of the neck region. The crossbar and neck region have geometries that satisfy a design metric that is less than 0.05.

An exemplary data storage device includes an actuator arm assembly, a top guide rail, a bottom guide rail, and a first ball bearing. The actuator arm assembly includes a first post defining a pivot axis that is inclined between about 5 degrees and about 25 degrees from a horizontal plane defined by a data storage disk surface. The top guide rail includes a first rolling surface that is parallel to the pivot axis. The bottom guide rail is spaced from the top guide rail and includes a second rolling surface that is parallel to the first rolling surface. The first ball bearing includes a first inner race and a first outer race, the first inner race surrounding the first post, and the first outer race in contact with the first rolling surface or the second rolling surface. An exemplary method of assembling a data storage device is also described.

The disk device according to one embodiment includes magnetic disks, a magnetic head, a ramp, and a suspension. The suspension includes a sliding portion provided on a load beam. The suspension rotates about a second rotation axis between a load position and an unload position. The ramp includes a wall and a protrusion. The wall has a first support surface that supports the sliding portion when the suspension is located in the unload position. The protrusion includes a second support surface and an intermediate portion. The second support surface faces the magnetic head when the suspension is located in the unload position. The intermediate portion is located between the wall and the second support surface. The intermediate portion includes a first portion and a second portion. The second portion is located between the first portion and the first support surface in the radial direction of the second rotation axis.

According to one embodiment, a magnetic disk device including a disk, a head that writes data to the disk and reads data from the disk, an actuator that is rotationally driven and controls movement of the head mounted above the disk, a microactuator that is mounted on the actuator and finely swings the head in a radial direction of the disk by a piezoelectric element that extends and contracts when a drive voltage based on a bias voltage is applied to the piezoelectric element, and a controller that switches the bias voltage according to an operation state during an access process.

A trace gimbal is described herein. In some embodiments, the trace gimbal includes outer struts including a front outrigger at a distal end of the trace gimbal and a rear outrigger at a proximal end of the trace gimbal. The front outrigger includes a distal front outrigger and a proximal front outrigger. The rear outrigger includes a distal rear outrigger and a proximal rear outrigger. A middle strut extends in a width direction of the trace gimbal, adjoining the proximal front outrigger to the rear outrigger, and connecting to a slider tongue. The front outrigger includes a strut form bent away from a load beam reference plane at an angle θ. In some embodiments, the outer struts include a second strut form disposed on the rear outrigger. The second strut form can be bent toward the load beam reference plane at the angle θ.

According to one embodiment, a head suspension assembly includes a base plate including a first main surface and a through-hole penetrating the first main surface, a load beam including a base end portion fixed to the base plate and extending from the base plate, a wiring member provided on the first main surface of the base plate and the load beam, and a magnetic head placed on the wiring member. The base plate includes a partition recess formed on the first main surface and continuously or intermittently extending to partition the magnetic head and the through-hole.