Ultra Density Optical 5.25-inch optical drive technology. UDO will utilize 405nm blue-violet laser and phase change technology from the recently announced consumer DVD type products. UDO media cartridges will be dimensionally identical to current 5.25-inch MO to provide compatibility with existing 5.25-inch library automation and both WORM and rewritable media will be available. The first generation product will provide 30GB capacity and a fast data transfer rate of up to 8MB/s. Future generations will increase capacity to 60GB and 120GB and still have backward read capability.