Buslink BDC-48-U2 Blu-ray Reader/DVD-Writer - BD-ROM/DVD±R/±RW Support - 4x BD Read/8x DVD Write - Double-layer Media Supported

Blu-ray Reader/DVD-Writer works well when you want to watch a full HD movie, install software program, create backup discs, and even more Double-layer media supported; means that you will burn 2 different layers on the disc thus greatly increasing (literally doubling) the storage capability