What is HD DVD?
High Density
HD DVD stands for ‘High-Density Digital Versatile Disc’. It is promoted by Toshiba, NEC and others and is supported by four major film studios. Our parent company, Mitsubishi Kagaku Media, is a member of the HD DVD development technology group which means that Verbatim has access to the latest in HD DVD technology.
The HD DVD disc, like the Blu-ray disc has a higher storage capacity using the same blue laser of 405nm wavelength compared to the standard red laser used in CD (780nm) and DVD (650nm) technology. However, HD DVD uses a lens system with a numerical aperture of 0.65 resulting in a slightly bigger laser spot. This makes the laser and disc less susceptible to scratches and fingerprints so that HD DVD requires no hard coating on the disc surface.
How a HD DVD Disc Works
Red Laser (DVD) technology
Data
Polycarbonate Layer 1
Recording Layer
Reflective Layer
Polycarbonate Layer 2
Disc Label
Blue Laser (HD DVD) technology
Data
Laser
Polycarbonate Layer 1
Recording Layer
Reflective Layer
Polycarbonate Layer 2
Disc Label
Minimum pit length = 0.4μm Track pitch = 0.74μm Capacity = 4.7GB | Minimum pit length = 0.173μm Track pitch = 0.40μm Capacity = 15GB |
