# DVD+R

> write-once, read-many form of DVD introduced by the DVD+RW Alliance in 2002

**Wikidata**: [Q1142274](https://www.wikidata.org/wiki/Q1142274)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/DVD+R)  
**Source**: https://4ort.xyz/entity/dvd-r-q1142274

## Summary
DVD+R is a write-once, read-many optical disc format introduced by the DVD+RW Alliance in 2002, allowing users to permanently store data such as videos, files, or backups. It combines the finality of physical media with the convenience of user-recordable content, serving as a widely adopted solution for data archiving and distribution.

## Key Facts
- **Introduced**: 2002 by the DVD+RW Alliance.
- **Storage Capacity**: 4,707,319,808 bytes (4.7 GB) per single layer.
- **Write Capability**: Write-once (non-rewritable) after data is recorded.
- **Classification**: Subclass of both "write once read many" and "DVD recordable" formats.
- **Compatibility**: Designed for use with DVD+RW drives and most standard DVD players.
- **Technical Standard**: Part of the DVD+R/DVD+RW format family, distinct from DVD-R/DVD-RW.

## FAQs
### Q: What is the maximum storage capacity of a single-layer DVD+R disc?
A: A single-layer DVD+R holds 4.7 GB (4,707,319,808 bytes) of data.

### Q: Can DVD+R discs be rewritten or edited after recording?
A: No, DVD+R discs are write-once, meaning data cannot be modified after being written.

### Q: How does DVD+R differ from DVD-R?
A: DVD+R and DVD-R are competing formats developed by different alliances (DVD+RW Alliance vs. DVD Forum), with differences in technical specifications and compatibility.

## Why It Matters
DVD+R played a significant role in the early 2000s as a user-friendly, high-capacity storage solution for both personal and professional use. It addressed the need for permanent, reliable data archiving and distribution, bridging the gap between rewritable media (e.g., DVD+RW) and professionally manufactured DVDs. Its introduction fueled competition in the optical disc market, driving innovation in storage technology and influencing consumer adoption of digital content creation. While largely supplanted by cloud storage and streaming, DVD+R remains relevant in niche applications like physical media distribution and long-term data backup.

## Notable For
- **Single-Layer Capacity**: Standardized 4.7 GB storage, optimized for video and large file backups.
- **Format Competition**: A key player in the "format war" between the DVD+RW Alliance and DVD Forum.
- **Backward Compatibility**: Designed for playback in most DVD-ROM drives and players.
- **Archival Stability**: Non-rewritable nature ensures data integrity for long-term storage.

## Body
### Development and Release
DVD+R was launched in 2002 by the DVD+RW Alliance, a consortium including Hewlett-Packard, Philips, and Sony. It emerged as a competing standard to DVD-R, emphasizing improved compatibility and ease of use.

### Technical Specifications
- **Data Size**: 4,707,319,808 bytes (4.7 GB) per single layer, documented in industry standards (OSTA) and technical references.
- **Write Mechanism**: Uses a blue or infrared laser to record data by altering the disc's reflective layer, which becomes immutable after writing.

### Relation to Other Formats
- **DVD+RW**: Unlike its rewritable counterpart, DVD+R cannot be erased or modified post-recording.
- **DVD-R**: Competing format with similar capacity but differing in recording technology and licensing agreements.

### Legacy
DVD+R saw widespread use in the 2000s for home video recording, software distribution, and data archiving. Its adoption declined with the rise of digital streaming and cloud storage but remains a recognized standard in optical media history.

## References

1. Freebase Data Dumps. 2013
2. [Source](http://www.osta.org/technology/dvdqa/dvdqa6.htm)