This application provides a storage method and apparatus, a device, and a storage medium, and relates to the field of electronic devices. In the method, a size of maximum available cache space of a storage device may be adjusted based on overall space usage of the storage device. By controlling the maximum available cache space of the storage device, overall space utilization of the storage device can be reduced, a size of available single-level cell cache space in the storage device can be maintained, and read/write performance of the storage device can be improved.