DVD+R

DVD+R. It is a recordable optical disc format for digital data storage, developed as a competing standard to the earlier DVD-R. Part of the broader DVD family, it was created by the DVD+RW Alliance, a consortium of technology companies including Philips, Sony, and Dell. The format is widely used for storing computer files, home video, and software distribution.

Overview

The development of this format was spearheaded by the DVD+RW Alliance, which sought to create a recordable standard with technical advantages over the existing DVD-R specification endorsed by the DVD Forum. Key members like Philips and Sony leveraged their experience from the CD-R and CD-RW markets. The format was officially introduced in 2002, entering a market already contested by formats like DVD-RAM. Its design prioritized features such as more accurate linking during writing and improved defect management, aiming for greater compatibility with existing DVD-Video players and DVD-ROM drives.

Technical specifications

The physical dimensions of the disc are identical to other DVD formats, with a diameter of 120 mm. It uses a phase-change recording layer with a dye polymer that is altered by a 650 nm laser diode in the recording drive. The standard single-layer disc has a capacity of 4.7 gigabytes, while the dual-layer variant, known as DVD+R DL, increases this to 8.5 GB. The data is written in a single, continuous spiral groove, and the format employs a wobbled pregroove for timing information, similar to CD-RW technology. Error correction is handled by the Reed-Solomon code system, a standard across optical storage media.

Comparison with DVD-R

The primary technical distinction lies in the addressing method; this format uses a high-frequency wobble modulation called ADIP (Address in Pregroove), whereas DVD-R uses a land pre-pit system. This difference affects how the recording laser diode locates data positions on the disc. Furthermore, the format's recording strategy typically allows for more precise linking of data sectors, which can result in better compatibility with some older DVD-Video players. The competing format, backed by the DVD Forum and pioneers like Pioneer Corporation, initially held a market lead, but technical debates often centered on these underlying writing methodologies.

Compatibility and adoption

Initial compatibility with standalone DVD players and DVD-ROM drives was a significant hurdle, as many early devices were designed only for the rival DVD-R format. However, through aggressive licensing and the widespread adoption of multi-format drives from manufacturers like LG Electronics and NEC, compatibility improved rapidly. Major software companies, including Microsoft with its Windows XP operating system, began supporting the format natively. While the DVD Forum did not officially endorse it, the format achieved near-ubiquitous support in computer optical disc drives and most consumer electronics by the mid-2000s, sharing the market with DVD-R in a largely format-agnostic environment.

Recording and usage

Recording requires a compatible DVD burner and software, such as Nero Burning ROM or the built-in utilities in Windows Vista. The process involves formatting the disc, after which data can be written in either a Disc At Once or Incremental recording mode. A key feature is the ability to use Mount Rainier for drag-and-drop file management, similar to a USB flash drive. Common applications include creating video backups, archiving personal photographs, and distributing large presentation files. The media is often sold by brands like Verbatim Corporation and Taiyo Yuden, and it remains a staple for physical data storage despite the rise of cloud storage and solid-state drives.

Category:Optical disc authoring Category:Computer storage media Category:2002 introductions