CD代表光盘是朝着信息数字编码思想迈出的第一步。它使用一种新颖的编码方法，其中 14 位代码表示计算机内存单元，并且这种编码技术共同有助于错误检测。它是存储设备的可接受替代品，因为它为存储大量知识提供了廉价的解决方案。
DVD代表Digital Versatile Disk，为磁带录音机(Video container Recorder)中使用的录像带和计算机中使用的固定存储提供了另一种形式，因为与 CD 相比，视频光盘将获得 7 倍的信息量。它以出色的图像质量和随机访问呈现视频。视频光盘由类似的材料构成，因为 CD 但是方法和因此层区域单元完全不同，它从每个边缘使用，就像 2 个 CD 区域单元沿投影。在 DVD 中，使用 RS-PC 和 EFMplus 作为纠错码。
CD 和 DVD 之间有一些区别，如下所示：
| S.NO | CD | DVD |
|---|---|---|
| 1. | The acquire size of CD is 700 MB. | While the acquire size of DVD is 4.7 GB to 17 GB. |
| 2. | In CD, the recording or metal layer is situated on the top of disk. | While in DVD, the recording or metal layer is situated in middle of disk. |
| 3. | There is only single pit layer in CD. | While there are double layers of pits in DVD. |
| 4. | In CD, there is 1.6 micrometer space between the spiral’s loops. | While in DVD, there is 0.74 micrometer space between the spiral’s loops. |
| 5. | A CD holds the 0.834 micrometer space between the pits. | While it holds the 0.4 micrometer space between the pits. |
| 6. | In CD, CIRC and EFMP are used as the error correction codes. | While In DVD, RS-PC and EFMplus are used as the error correction codes. |
| 7. | There can cause the damage in metal layer after the Removal of the adhesive labels, in CD. | While there is caused the imbalance in the spin after the Removal of the adhesive labels, in DVD. |
| 8. | In CD, the data transfer rate is 1.4 MB to 1.6 MB/sec. | While in DVD, the data transfer rate is 11 MB/sec. |
| 9. | The channel bit length in Cd is 300 nanometer. | While the channel bit length in DVD is 113 nanometer which is less than CD’s channel bit length. |
| 10. | The numeric aperture of CD is 0.45. | While the numeric aperture of DVD is 0.6. |
| 11. | The thickness of CD is 1.2 mm. | While the thickness of DVD is 0.6 mm. |