conscious (small): this is the part of the mind that holds what you�re aware of. You can verablize about your conscious experience and you can think about it in a logical fashion.
preconscious (small-medium): this is ordinary memory. So although things stored here aren�t in the conscious, they can be readily brought into conscious.
unconscious (enormous): Freud felt that this part of the mind was not directly accessible to awareness. In part, he saw it as a dump box for urges, feelings and ideas that are tied to anxiety, conflict and pain. These feelings and thoughts have not disappeared and according to Freud, they are there, exerting influence on our actions and our conscious awareness. This is where most of the work of the Id, Ego, and Superego take place.