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.
1. A disk device comprising:
a housing having a maximum height of 26.1 mm, defined by 3.5-inch disk device standards;
ten or more but twelve or less magnetic disks disposed in the housing and opposing each other at intervals; and
suspension assemblies each supporting a magnetic head, and being movable in a space between the magnetic disks,
a gap between two adjacent magnetic disks opposing each other being 1.2 mm or more but 1.5 mm or less, and
a thickness of the magnetic disks being 0.35 mm or more but 0.5 mm or less.
2. The disk device of claim 1 , wherein
each of the suspension assemblies comprises a base plate, a load beam extending from the base plate and comprising a proximal end portion joined to the base plate and including a bendable location, and a distal end portion including a support projection, a tab extending from a distal end of the load beam, and a wiring member comprising a gimbal portion and disposed on the load beam and the base plate, and
the magnetic head is mounted on the gimbal portion and abutting on the supporting projection via the gimbal portion.
3. The disk device of claim 2 , wherein
each of the suspension assemblies comprises an expandable/contractable piezoelectric element mounted on the wiring member.
4. The disk device of claim 2 , wherein
the magnetic head comprises a slider mounted on the gimbal portion and having an outflow end, and
a ratio of a distance from the bendable location of the load beam to the outflow end of the slider, with respect to a distance from the tip of the tab to the outflow end of the slider is 4 or more but 6 or less.
5. The disk device of claim 2 , which further comprises a ramp comprising a plurality of guide surfaces, on which the tabs are climbable, respectively,
wherein in each suspension assembly, a ratio of a distance from the bendable location of the load beam to a ramp loading point of the tab in contact with a respective one of the plurality of guide surfaces, with respect to a distance from the tip of the tab to the ramp loading point is 18 or more but 21 or less.
6. The disk device of claim 5 , wherein
each of the guide surfaces of the ramp includes a first slope which inclines and extends from near a surface of the respective magnetic disk in a direction away from the magnetic disk, and a support surface continuously extends from the first slope substantially parallel to the surface of the magnetic disk, and
a distance between one end and other end of the first slope in a direction perpendicular to the surface of the magnetic disk is 0.3 mm or more but 0.35 mm or less.
7. The disk device of claim 6 , wherein
the ramp comprises the guide surfaces opposed each other with a gap therebetween,
a gap between the support surfaces of the opposing guide surfaces is 0.2 mm or more but 0.25 mm or less.
8. The disk device of claim 1 , which further comprises a spoiler provided in the housing and comprising a plurality of fins each inserted a gap between two adjacent magnetic disks,
wherein a thickness of a proximal end portion of each of the plurality of fins is 0.45 mm or more but 0.8 mm or less.
9. The disk device of claim 2 , wherein
a ratio of a distance from the bendable location of the load beam to a center of the support projection with respect to a distance from the center of the dimple to a tip of the tab being set to 2.8 or more but 3.8 or less.