Blu-ray discs are designed especially to store large HD video and audio files. | All PlexDisc Blu-ray discs are treated with a super hard coat to prevent scratches, | PlexDisc Blu-ray discs use blue-violet laser technology to read and write data. superb resolution, excellent contrast, vivid colors and amazing sound. | The PlexDisc double-layer Blu-ray disc offers up to 50GB of storage space to back-up your video, music, photos and more. | Printable: The PlexDisc printable Blu-ray disc has a super white printable surface that offers full-surface edge-to-edge printing