Disk device

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 ramp comprises the guide surfaces opposed to each other with a gap therebetween,
• each of the guide surfaces of the ramp includes a first slope that inclines and extends from near a surface of the respective magnetic disk in a direction away from the magnetic disk, and a support surface that continuously extends from the first slope in a direction away from the magnetic disk, and
• a minimum gap between the support surfaces of the opposing guide surfaces is 0.2 mm or more but 0.25 mm or less.