What is the difference between Blu-ray and HD-DVD?
Parameters Blu-ray HD-DVD Storage capacity 25GB (single-layer) 50GB (dual-layer) 15GB (single-layer) 30GB (dual-layer) Laser wavelength 405nm (blue laser) 405nm (blue laser) Numerical aperture (NA) 0.85 0.65 Disc diameter Disc thickness 120mm 1.2mm 120mm 1.2mm Protection layer Hard coating 0.1mm Yes 0.6mm No Track pitch 0.32µm 0.40µm Data transfer rate (data) Data transfer rate (video/audio) 36.0Mbps (1x) 54.0Mbps (1.5x) 36.55Mbps (1x) 36.55Mbps (1x) Video resolution (max) Video bit rate (max) 1920×1080 (1080p) 40.0Mbps 1920×1080 (1080p) 28.0Mbps Video codecs MPEG-2 MPEG-4 AVC SMPTE VC-1 MPEG-2 MPEG-4 AVC SMPTE VC-1 Audio codecs Linear PCM Dolby Digital Dolby Digital Plus Dolby TrueHD DTS Digital Surround DTS-HD Linear PCM Dolby Digital Dolby Digital Plus Dolby TrueHD DTS Digital Surround DTS-HD Interactivity BD-J HDi
