A Blu-Ray storage unit is a device used to store and play Blu-Ray discs. It is a type of optical DISC storage device, which uses a laser to read and write data onto the DISC. Blu-Ray storage units are typically used for high-definition video and audio playback, as well as for storing large amounts of data. The term DISC is an acronym for Digital Information Storage Compact, which is the type of DISC used in Blu-Ray storage units.