Abstract: According to one embodiment, a disk device includes two magnetic disks opposing each other at intervals of 1.2 to 1.5 mm, and at least two suspension assemblies movable respectively between the two magnetic disks. Each of the suspension assemblies includes a base plate, a load beam extending from the base plate, a tab extending from a distal end of the load beam, a wiring member on the load beam and the base plate, including a gimbal portion, and a magnetic head on the gimbal portion, abutting on a dimple of the load beam via the gimbal portion. The ratio of a distance from a bendable location of the load beam to a center of the dimple with respect to a distance from the center of the dimple to a tip of the tab is 2.8 to 3.8.

Abstract: According to one embodiment, a disk device includes two magnetic disks opposing each other at intervals of 1.2 to 1.5 mm, and at least two suspension assemblies movable respectively between the two magnetic disks. Each of the suspension assemblies includes a base plate, a load beam extending from the base plate, a tab extending from a distal end of the load beam, a wiring member on the load beam and the base plate, including a gimbal portion, and a magnetic head on the gimbal portion, abutting on a dimple of the load beam via the gimbal portion. The ratio of a distance from a bendable location of the load beam to a center of the dimple with respect to a distance from the center of the dimple to a tip of the tab is 2.8 to 3.8.

Abstract: According to one embodiment, a disk device comprises a plurality of rotatable magnetic disks, a first actuator assembly, and a second actuator assembly. A slit provided in each of arms of the first actuator assembly is provided to be offset in a direction spaced away from a border plane between actuator assemblies with respect to a center of the arm in its thickness direction. A connection end portion of a wiring member is partially located in the slit, such as to be offset in a direction spaced away from the border plane, and disposed on a wiring board, and joined to the wiring board.

Abstract: A boost converter disclosed herein may include boost circuits including: a diode including a cathode connected to a high-potential output wiring; a switching element including a terminal connected to an anode of the diode and a terminal connected to a low-potential wiring; and a reactor connected between the high-potential input wiring and the anode. A control circuit may energize, in a first operation, a first boost circuit when charge current is in a first range, and energize the first and a second boost circuits when the charge current is in a second range larger than the first range. The control circuit may energize, in a second operation, a third boost circuit when the charge current is in the first range, and energize the third and a fourth boost circuits when the charge current is in the second range. The first boost circuit is other than the third boost circuit.

Abstract: A boost converter disclosed herein may include boost circuits including: a diode including a cathode connected to a high-potential output wiring; a switching element including a terminal connected to an anode of the diode and a terminal connected to a low-potential wiring; and a reactor connected between the high-potential input wiring and the anode. A control circuit may energize, in a first operation, a first boost circuit when charge current is in a first range, and energize the first and a second boost circuits when the charge current is in a second range larger than the first range. The control circuit may energize, in a second operation, a third boost circuit when the charge current is in the first range, and energize the third and a fourth boost circuits when the charge current is in the second range. The first boost circuit is other than the third boost circuit.

Abstract: A disk apparatus includes a base including a bottom wall, a sidewall provided along a peripheral portion of the bottom wall, and a plurality of corner portions, a painted surface formed on at least an inner surface of the base, a plate-like cover attached to the base, the cover including an edge surface and a plurality of corner portions facing an inner surface of the base, and a rotatable recording medium disposed between the base and the cover. The sidewall of the base includes a plurality of protruding portions that are each disposed at a position corresponding to one of the corner portions of the cover and includes a contact surface configured to contact the edge surface of the cover.

Abstract: A disk apparatus includes a base including a bottom wall, a sidewall provided along a peripheral portion of the bottom wall, and a plurality of corner portions, a painted surface formed on at least an inner surface of the base, a plate-like cover attached to the base, the cover including an edge surface and a plurality of corner portions facing an inner surface of the base, and a rotatable recording medium disposed between the base and the cover. The sidewall of the base includes a plurality of protruding portions that are each disposed at a position corresponding to one of the corner portions of the cover and includes a contact surface configured to contact the edge surface of the cover.

Abstract: According to one embodiment, a disk drive includes a base including a bottom wall and a side wall, a cover including a top plate screwed on the side wall, a side plate provided along a peripheral edge of the top plate and opposing to an outer surface of the side wall, and an opening formed in the side plate, a sealing member held between the top plate of the cover and an upper end face of the side wall, and a recording medium rotatably provided at the bottom wall. The side wall of the base includes a first portion located adjacent to the recording medium, and a projecting portion projecting from the first portion outward of the side wall and located in the opening of the side plate.

Abstract: An overcurrent protection circuit that protects a load from an overcurrent includes: a load current cutoff condition defining unit configured to set two or more load current cutoff conditions in each of which passage of a load current larger than or equal to a specified current for a specified time or longer is set as a condition for cutting off the load current; a detection unit configured to detect passage of the load current larger than or equal to the specified current for the specified time or longer in at least one of the two or more load current cutoff conditions; and a load current cutoff unit configured to cut off the load current when the detection unit detects that at least one of the load current cutoff conditions is satisfied.