When I think of the mind I tend to think of it like a single pea on top of a duffel bag. The pea is the conscious mind and the duffel is the unconscious mind.
It is easy to forget how huge the unconscious mind is but that is basically where we store everything. The conscious mind exists for the moment, but the minute something drifts into the past it becomes caught up in whatever sticky ether constitutes the unconscious mind. I know that this is not scientific but I think we can talk about the mind in a philosophical way as well.