DVD+RW

DVD+RW
A spindle with discs of the DVD+RW format
Optical discs
Optical media types
Standards
See also
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DVD+RW is a physical format for rewritable DVDs and can hold up to 4.7 GB. DVD+RW was created by the DVD+RW Alliance, an industry consortium of drive and disc manufacturers. Additionally, DVD+RW supports a method of writing called "lossless linking", which makes it suitable for random access and improves compatibility with DVD players.[1]

DVD+RW must be formatted before recording by a DVD recorder.

The rewritable DVD+RW standard was formalized earlier than the non-rewritable DVD+R (the opposite was true with the DVD- formats). Although credit for developing the standard is often attributed unilaterally to Philips, it was "finalized" in 1997 by the DVD+RW Alliance. It was then abandoned until 2001, when it was heavily revised (in particular, the capacity increased from 2.8 GB to 4.7GB).[citation needed]

Contents

Technical details

The recording layer in DVD+RW and DVD-RW discs is a phase change metal alloy (often GeSbTe) whose crystalline phase and amorphous phase have different reflectivity. The states can be switched depending on the power of the writing laser, so data can be written, read, erased and re-written. DVD-R and DVD+R discs use an organic dye.

The capacity of a single-layer disc is approximated as 4.7 × 109 bytes. In actuality, the disc is laid out with 2295104 sectors of 2048 bytes each which comes to 4,700,372,992 bytes, 4,590,208 kibibytes (KiB, binary kilobytes), 4482.625 mebibytes (MiB, binary megabytes), or 4.377563476 gibibytes (GiB, binary gigabytes).

Dual layer

A dual-layer DVD+RW specification was approved in March 2006 with a capacity of 8.5 GB.[2] However, manufacturing support for rewritable dual-layer discs did not materialize due to costs and expected competition from newer formats like Blu-ray and HD DVD, which boasted up to 25 GB on a single layer.

See also

References

  1. ^ http://www.tomshardware.com/reviews/dvd-burner-test,586-2.html
  2. ^ DVD+RW part 2: Dual Layer, volume 1; DVD+RW 8.5 Gbytes, Basic Format Specifications, version 1.0, March 2006

Further reading

External links


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  • DVD-R — DVD enregistrable Gravure de disque optique Disque optique Image disque Graveurs Logiciel de gravure Types de disques optiques Laserdisc CD / CD ROM : CD R, CD RW, CD+G, VCD, SVCD SACD DVD : DVD R …   Wikipédia en Français

  • DVD-R DL — DVD enregistrable Gravure de disque optique Disque optique Image disque Graveurs Logiciel de gravure Types de disques optiques Laserdisc CD / CD ROM : CD R, CD RW, CD+G, VCD, SVCD SACD DVD : DVD R …   Wikipédia en Français


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