The history and status quo of optical data storage was reviewed in this paper. In big data era, the usage and meaningfulness of optical disc was discussed. Because of the low capacity and slow rate of optical disc, the effective technique solution of Optical Library was introduced. In the last the holographic data storage technologies as the next generation of optical disc were described. Collinear Holography is one of the technologies which can be compatible with existing disc storage systems, like CD and DVD, and enable us to store the Big Data with its high density, high data rate and long life time.