Optical disc
Before the advent of the modern SAN and much cheaper hard disks, high-volume storage on DVD was more cost-effective than magnetic media. Jukebox capacities have greatly increased with the release of the 50 gigabyte (GB) dual layer Blu-ray (BD) format, with a road-map to increase to eight layers and 200 GB per disc. The current format, used in the DISC7000, allows 35 TB of storage from a single 700-disc jukebox. Optical disc libraries like the TeraStack Solution can store up to 142 TB of online and nearline data with a nominal power draw of 425 watts. These two units show the wide variance of product attributes.