Storage mediums similar to or like HD DVD

Digital optical disc storage format. Designed to supersede the DVD format, capable of storing several hours of video in high-definition video . Wikipedia

Between the Blu-ray and HD DVD optical disc standards for storing high-definition video and audio; it took place between 2006 and 2008 and was won by Blu-ray Disc. The two formats emerged between 2000 and 2005 and attracted both the mutual and exclusive support of major consumer electronics manufacturers, personal computer manufacturers, television and movie producers and distributors, and software developers. Wikipedia

This article compares the technical specifications of multiple high-definition formats, including HD DVD and Blu-ray Disc; two mutually incompatible, high-definition optical disc formats that, beginning in 2006, attempted to improve upon and eventually replace the DVD standard. The two formats remained in a format war until February 19, 2008, when Toshiba, HD DVD's creator, announced plans to cease development, manufacturing and marketing of HD DVD players and recorders. Wikipedia

Digital optical disc data storage format invented and developed in 1995 and released in late 1996. Widely used for software and other computer files as well as video programs watched using DVD players. Wikipedia

Optical disc format designed for high-density storage of high-definition video and data. 133.35 mm ISO cartridge optical disc which can store up to 30 GB of data. The second generation UDO2 media was introduced in April 2007 and has a capacity of up to 80 GB. Utilising a design based on a Magneto-optical disc, but using Phase Change technology combined with a blue violet laser, a UDO/UDO2 disc can store substantially more data than a magneto-optical disc or MO, because of the shorter wavelength (405 nm) of the blue-violet laser employed. MOs use a 650 nm-wavelength red laser. Because its beam width is shorter when burning to a disc than a red-laser for MO, a blue-violet laser allows more information to be stored digitally in the same amount of space. Wikipedia

High-capacity red-laser optical disc technology designed by New Medium Enterprises, Inc.. Intended to compete with the blue-laser Blu-ray Disc format and had an initial capacity of up to 30GB per side. Wikipedia