Disk device with ramp mechanism

A disk device comprising:

• a magnetic disk including a recording surface;
• a magnetic head configured to read and write information from and to the magnetic disk;
• a suspension configured to hold the magnetic head and to move between a load position where the magnetic head is located on the recording surface and an unload position where the magnetic head is located away from the recording surface;
• a ramp mechanism including
• a ramp member configured to hold the suspension at the unload position, and
• a cylindrical member with a through hole, being fixed to the ramp member;
• a housing including a first support surface with a screw hole supporting the cylindrical member, the housing accommodating the magnetic disk, the magnetic head, the suspension, and the ramp mechanism;
• and
• a screw including
• a screw head, and
• a screw shaft extending from the screw head to be fitted into the screw hole through the through hole,
• the screw holding the cylindrical member between the screw head and the first support surface,
• wherein a static friction coefficient between the cylindrical member and the housing is set to be larger than a static friction coefficient between the cylindrical member and the screw head.