HD DVD versus Blu-ray

HD DVD vs Blu-ray, which is better? Now let's have a comprehensive understanding of both. First, what do they mean respectively?HD DVD, which is the advanced format for DVD, means High-Definition DVD or High-Density DVD, while Blu-ray, also known as Blu-ray Disc (BD) is the name of a next-generation optical disc format. They both use blue-violet laser, which has a shorter wavelength (405 nm) than red laser used in DVD and can store more data than DVD. Next, how much data can they store? Normally, HD DVD can store about 15GB on a single layer disc and 30GB on a dual layer disc.