What are the differences between Blu-ray Disc and HD DVD?
Each next-generation DVD format comes in single-layer and dual-layer formats. For Blu-ray Disc, it is 25GB and 50GB; for HD DVD, that means capacities of 15GB and 30GB. 10 BLU-RAY DISC FAQS • How should a Blu-ray Disc be cared for? Blu-ray Discs should be treated basically the same way a DVD or CD is treated. Keep your discs and the inside of your player free from dust and debris. Be especially careful not to scratch or put fingerprint marks on the recording surface of the disc, and keep them away from extreme temperatures and humidity. • What are the technical differences between Blu-ray Disc and HD DVD? Blu-ray Disc/HD DVD Format Comparison Chart ParametersBlu-ray DiscHD DVD Capacity per layer (GB)2515 Number of layers1 or 21 or 2 Number of sides11 or 2 Substrate + cover layer (mm)1.1 + 0.10.6 + 0.6 Laser wavelength (nm)405405 Numerical aperture0.850.65 CartridgeNoNo Tilt control neededNoYes Hard coating neededYesNo Complexity to read DVDMore complexNone Data transfer rate36Mbps36Mbp
