BDXL stands for Blu-ray Disc Extra Large. BDXL discs can store much more data than a standard Blu-ray. A standard Blu-ray disc records data in one or two layers. Single-layer Blu-rays have a capacity of 25GB. Dual-layer discs top out at 50GB. Conversely, BDXL discs are available in three or four layers. Triple-layer BDXL discs have 100GB, and quad-layer BDXL discs can store 128 GB.