Panasonic 50GB Blu-ray BD-RE Printable Rewritable discs are the industry standard for archival and storage of large amounts of computer data. * The 50 GB capacity of Blu ray re-writable double layer discs are great for authoring and backup of high definition (HD) entertainment such as movies and television shows. * Panasonic 50 GB BD-RE Printable discs are compatible with all Blu-ray burners and players on Mac and Windows computers. * Packaged and shipped in a 25-piece media spindle. * Able to record, format and re-record 50GB of data on each disk