Provided in the present application are a data writing method and a storage device. The method is for use in a solid-state drive (SSD). The method comprises: receiving a write command, the command carrying the type of data to be written; determining, on the basis of the type of the data to be written, the type of a storage area in the SSD for writing the data to be written, the SSD comprising various types of storage areas; determining, on the basis of the type of the storage area, a target storage area for writing the data to be written; and writing into the target storage area the data to be written. Embodiments of the present application increases the efficiency of data processing.