Blu-ray is a video format known as Blu-ray Disc (BD) and invented by Blu-ray association. This format enables users to play HD videos and store more data in a single disc. It stores up to 50GB data in a dual-layer disc. The greatest benefit of using Blu-ray is that it comes with a very short wavelength compared to red laser. In short, it can easily store more data in less space by packing data more tightly.