Blu-ray discs are designed especially to store large HD video and audio files. All Optical Quantum Blu-ray discs are treated with a super hard coat to prevent scratches, resist fingerprints and reduce dust build-up Blu-ray discs use blue-violet laser technology to read and write data. NOT compatible with all LG 6x, LG 8x, Pioneer 4x, and Pioneer 8x Blu-ray burners. Please go to opticalquantum.com for more info. This double-layer Blu-ray disc offers up to 50 GB of storage space to back-up your video, music, photos and more.