PRESENTED BY
BIJAYA MOHARANA

---

[attachment=5747]

---

Introduction

The HD DVD name is derived from its origination as a high-definition extension of the DVD optical disc format.

 An HD DVD disc can store substantially more data than a standard DVD, because of the shorter wavelength (405 nm) of the blue-violet laser (DVDs use a 650-nm-wavelength red laser and CDs an infrared 780 nm laser), which allows more information to be stored digitally in the same amount of physical space.


 HD DVD shares the same basic disc structure as a standard DVD: back-to-back bonding of two 0.6 mm thick, 120 mm diameter substrates.

 The 30 GB dual-layer HD DVDs have been used on nearly every movie released in this format.