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Video CD
Application：
Read-only CD-ROM discs are used to store digital video and audio data with a quality that is akin to VHS tapes and are widely used for distribution of movies, scenic pictures or karaoke.
Feature：
- Common and supported hardware devices for playing are: home or car DVD/VCD/CD player and personal computers installed with DVD-ROM/CD-ROM drives and media player software.
- Compact in size, light and easy to carry: the outer diameter of Video-CD disc is only 12 cm with a mere thickness of 12mm, hard to scratch and resistant to dust, and extremely easy to carry
- Video and sound quality superior to VHS: Although the Video-CD effects cannot be compared with the DVD-Video but compared with the VHS tapes in the past, the Video-CD still has better video and sound quality. Furthermore, it has the advantages of quick search for segments without reducing the audio-visual effects due to abrasion
Specification：
Characteristics of Video-CD
| Item | Specifications |
| Capacity | 650MB (74min) / 180MB(21min) |
| Outer diameter | 120±0.30 mm or 80±0.30mm |
| Track pitch | 1.5-1.7 um |
| Radial deviation | ±1.6 degree |
| Tangential deviation | ±0.8 degree |
| Reflectivity | >70 |
| Jitter | <35 ns |
| Wavelength of laser diode | 780nm |
| Numerical aperture of objective | 0.45 |
(Characteristics are the same as CD-ROM)
Video-CD Data Storage Specifications
- A single Video-CD can store a maximum of roughly 74 minutes of dynamic video and sound data.
- Image: Compressed dynamic digital images (NTSC resolution is 360×240, PAL resolution is 352×288)using MPEG-1 technology
- Sound: MPEG-1 Layer 2 technology compression supporting only 2 sound channels with 224 kbits/secsound transmission rate.
CD Audio
Application：
Music CDs (CD-DA, CD Digital Audio) is the first and currently mainstream digital music recording media in the history of mankind. It is widely used for playing music at home, in cars, on PC and with portable CD players.
Feature：
- Common and supported hardware devices for playing are: home or car DVD/VCD/CD Player, portable CD player, personal computers installed with DVD-ROM/CD-ROM drives and media player software(currently some music CDs with anti-piracy technology cannot be played on PCs).
- Compact in size, light and easy to carry: the outer diameter of music CD disc is only 12 cm with a mere thickness of 1.2mm, hard to scratch and resistant to dust, and extremely easy to carry.
- Great music quality: Although the sound quality of the music CD cannot match the new generation of high fidelity DVD-Audio or SACD, but comparing it with the analog music storage medium in the past, the music CD with crispier sound quality, dynamics and more details still holds the edge.
Specification：
Characteristics of CD-Audio
| Disc Parameters | Specifications |
| Capacity | 650MB(74min) / 180MB(21min) |
| Outer diameter | 120±0.30 mm or 80±0.30mm |
| Track pitch | 1.5-1.7 um |
| Radial deviation | ±1.6 degree |
| Tangential deviation | ±0.8 degree |
| Reflectivity | >70 |
| Jitter | <35 ns |
| Wavelength of laser diode | 780nm |
| Numerical Aperture of objective | 0.45 |
(Characteristics are the same as CD-ROM)
Sound: Sound signals in Linear PCM Wave format, sampling frequency is 44.1kHz, bits per sample is 16 bits. The maximum music storage time per CD is 74 minutes.
CD-ROM
Application：
CD-ROM is applicable in CD-ROM drives in personal computers. Computer hardware or software manufacturers can distribute or produce program software on read-only CD-ROM for sale or free distribution to consumers.
CD-ROM discs can store operating systems or application programs for personal computers. These CD-ROM disc data can be read from the CD-ROM drive, CD-R/-RW drive, DVD-ROM drive or DVD-R/-RW/+R/+RW/-RAM drive installed on personal computers, expanding the functions or application range of the computers.
Feature：
- Large capacity: A single CD-ROM disc has a storage capacity of 650 MB. One CD-ROM disc is usually enough to store most computer application programs.
- Common compatible and supported disc drives: disc drives have become standard devices in personal computers. CD-ROMs can be read in any personal computer with a CD or DVD disc drive (read-only or writer) installed
- Low cost: Compared with the bonding of the top and bottom layers of the DVD-ROM, the CD-ROM disc manufacturing cost is much cheaper.
Specification：
Characteristics of CD-ROM
| Disc Parameters | Specifications |
| Capacity | 650MB / 180MB |
| Outer diameter | 120±0.30 mm or 80±0.30 mm |
| Track pitch | 1.5-1.7 um |
| Radial deviation | ±1.6 degree |
| Tangential deviation | ±0.8 degree |
| Reflectivity | >70 |
| Jitter | <35 ns |
| Wavelength of laser diode | 780nm |
| Numerical Aperture of objective | 0.45 |