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;
ten or more but twelve or less magnetic disks disposed in the housing and opposing each other at intervals;
suspension assemblies each supporting a magnetic head, and being movable with respect to the magnetic disks; and
a ramp comprising a plurality of guide surfaces, on which tabs of the suspension assemblies are climbable, respectively,
wherein the suspension assemblies each comprising a base plate, a load beam extending from the base plate and including a proximal end portion joined to the base plate and including a bendable location and a distal end, a tab extending from the distal end of the load beam, and a wiring member disposed on the load beam and the base plate, and the magnetic head is mounted on the wiring member, and
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 a tip of the tab to the ramp loading point is 18 or more but 21 or less.
2. The disk device of claim 1 , wherein
a thickness of the magnetic disks being 0.35 mm or more but 0.635 mm or less.
3. The disk device of claim 1 , wherein
the housing has a maximum height of 26.1 mm, defined by 3.5-inch disk device standards.
4. The disk device of claim 1 , wherein
each of the suspension assemblies comprises an expandable/contractable piezoelectric element mounted on the wiring member.
5. The disk device of claim 1 , wherein
the load beam comprises a distal end portion including a support projection,
the magnetic head is mounted on the waring member and abutting on the supporting projection via the wiring member, and
a ratio of a distance (La) from the bendable location of the load beam to a center of the supporting projection with respect to a distance (Lb) from the center of the supporting projection to the tip of the tab being set to 2.8 or more but 3.8 or less.
6. The disk device of claim 1 , wherein
a gap between two adjacent magnetic disks opposing each other is 1.2 mm or more but 1.5 mm or less.
7. The disk device of claim 1 , 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.
8. The disk device of claim 7 , 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.
9. 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.