Blu-ray recordables (BD-R) and Blu-ray rewritables (BD-RE) are the current standards for both high capacity burning (up to 50GB) and high definition playback. Blu-ray's biggest advantage over DVD is maximum storage capacity, beating DVD recordable's largest capacity disc by more than 5 times. This is due to the type of laser Blu-ray recordable drives use, which is blue-violet in color, and allows for data to be packed more tightly in less space. Currently there are four types of Blu-ray media: BD-R 25GB - single layer, write once. BD-RE 50GB - double/dual layer, write once. BD-RE 25GB - single layer, rewritable. BD-RE 50GB - double/dual layer, rewritable.