Short for
Advanced Optical Disc,
Blu-ray’s competing
HD-DVD technology format. AOD and Blu-ray are similar in that they both use 405
nm-wavelength blue-violet laser technology, in contrast to the 650nm-wavelength red laser technology used in traditional
DVD formats. However, while Blu-ray has a storage capacity of 27
GB on a single-layer disc, AOD has a storage capacity of 20GB on a single-layer disc.
AOD was developed jointly by Toshiba and NEC.