1. 蓝光：
蓝光是由蓝光光盘协会开发的一种大数据存储数字光盘，能够以高清晰度存储数小时的视频。在蓝光中，原始数据、音频以及视频和视频的最大比特率分别为 53.95 Mbps、48 Mbps 和 40 Mbps。它比 DVD 厚，但与 HD DVD 相似。
2. 高清影碟：
HD DVD是 High Definition Digital Versatile Disc 的缩写。它由 DVD Forum Toshiba 开发。它是 DVD 的继任者，DVD 是一种用于存储比 DVD 更大的数据和播放高清视频的光盘。在 HD DVD 中，原始数据、音频以及仅视频和视频的最大比特率分别为 36.55 Mbps、30.24 Mbps 和 29.4 Mbps。
蓝光和 HD DVD 的区别：
| S.NO | Blu-ray | HD DVD |
|---|---|---|
| 1. | Blu-ray has a single layer storage size of 25 GB. | While HD DVD has a single layer storage size of 15 GB. |
| 2. | The Blu-ray laser wavelength is 405 nanometers. | While its laser wavelength is also 405 nanometers but lower than the DVD laser wavelength. |
| 3. | The Blu-ray numerical aperture is 0.85. | While its numerical aperture is 0.65. |
| 4. | In Blu-ray, hard coating of the disc is mandatory. | Whereas in HD DVD, hard coating of disc is optional. |
| 5. | Blu-ray has a double layer storage size of 50 GB. | While HD DVD has a double layer storage size of 30 GB. |
| 6. | Blu-ray is more expensive than HD DVD. | While it is cheaper than Blu-ray. |
| 7. | The Blu-ray Disc Association developed Blu-ray. | Whereas it is developed by DVD Forum Toshiba. |
| 8. | The Blu-ray data transfer speed is 4.5 MB/sec. | While its data transfer speed is around 4.5 MB/sec which is higher than DVD. |