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 128 gigabyte (GB) quad 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 DISC ArXtor7000 library, allows 89 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. The optical storage archive library from Zerras allows up to 25TB of removeable optical storage in a single unit library with a power draw of 60 watts per unit and scale to 200TB in a 42U rack cluster. The Zerras Icebox differs from Sony Optical Data Archive libraries is it uses approved standard dual, tri, and quad layer blu-ray discs rather than proprietary Archival Disc standard format which is not backward compatible to standard blu-ray drives and discs in the market. Management software The core functionality of optical library management software can be broken down into four parts: robotic control, filesystem authoring, file tracking, and access control. Robotic control All optical libraries comply with the standard SCSI command set. These commands are used for control and library geometry querying. When the management software is run, it will send inquiry requests to the optical library for the status of its contents. Number and type of drives, number and status of slots and other essential information is gathered. Following this, the management software may request data off of a particular piece of media or it may wish to perform some write operations on it. Any of these actions would require specific move commands sent from the management application to the optical library. An example of this would be to move a media from slot 50 to the drive number 3. Filesystem authoring Optical library management software handles all of the writing and reading of the filesystem content on the optical media. Once a media has been placed in a drive from its home slot, many operations can be taken. For example: The creation of a UDF filesystem on a blank media, the writing of a single file, or the reading of some data off of the filesystem on the media. Filesystem types