A data storage is optical addressing.

Device (100) of data storage, comprising. - a stack of layers comprising at least one memory layer (106) adapted to provide a storage data in a plurality of portions of the memory layer by changing at least one physico-chemical property of the material of said portions of the storage layer under the effect of an electric current through said portions of the memory layer; - a plurality of photoconductive columns (110) disposed in the stack of layers and passing through each layer of this stack; each of said portions of the memory layer surrounding a photoconductive columns.