The invention provides a hard disc device, comprising a magnetic head and a disc body, wherein the magnetic head and the disc body are provided with low-friction atomic scale smooth surfaces; and each low-friction atomic scale smooth surface comprises monolayer graphene, molybdenium disulfide, bismuth, molybdenum, mica and the like. Vander wale force between the low-friction atomic scale smooth surfaces is used as soft support, thus greatly reducing the distance of the magnetic head and the disc body, correspondingly improving the storage density of a magnetic disc, and being capable of realizing contact reading and writing to a hard disc. Simultaneously, due to the extreme low friction coefficient between the atomic scale smooth surfaces, the extreme high rotating speed can be easily realized, so the reading and writing speed of data of the hard disc can be improved. In addition, the hard disc device can well solve the defects of the traditional hard disc in the aspects of high-low temperature resistance, vibration resistance, shock resistance and the like, and greatly improves the stability of the hard disc.