Disk device with magnetic recording media and improved impact resistance

A disk device comprising:

• a housing including a bottom wall and a cover opposing the bottom wall;
• a plurality of magnetic recording media disposed in the housing in a multi-layered manner to be coaxial with each other with intervals therebetween;
• and
• a plurality of spacer rings, one of the spacer rings being disposed between each adjacent pair of the plurality of magnetic recording media,
• at least one of an uppermost magnetic recording medium adjacent to the cover and a lowermost magnetic recording medium adjacent to the bottom wall comprising a substrate having a rigidity higher than that of substrates of the other magnetic recording media, and
• one or more of the plurality of spacer rings being in contact with the magnetic recording media comprising the substrate having the higher rigidity, and having a thermal expansion coefficient different from a thermal expansion coefficient of the other spacer rings.