Editing Optical disc (section)

=== Recording types ===
An optical disc is designed to support one of three recording types: read-only (such as CD and [[CD-ROM]]), recordable (write-once, like [[CD-R]]), or re-recordable (rewritable, like [[CD-RW]]). Write-once optical discs commonly have an organic dye (may also be a ([[phthalocyanine]]) [[azo dye]], mainly used by [[Verbatim (brand)|Verbatim]], or an oxonol dye, used by [[Fujifilm]]<ref name="auto4">{{Cite web |url=https://www.fujifilm.com/products/storage/pdf/fujifilm_datamedia_catalog_dvd_01.pdf |title=Fujifilm &#91;Global&#93; |access-date=2020-04-13 |archive-url=https://web.archive.org/web/20180714050219/http://www.fujifilm.com/products/storage/pdf/fujifilm_datamedia_catalog_dvd_01.pdf |archive-date=2018-07-14 |url-status=live }}</ref>) recording layer between the substrate and the reflective layer. Rewritable discs typically contain an [[alloy]] recording layer composed of a [[phase change material]], most often [[AgInSbTe]], an alloy of [[silver]], [[indium]], [[antimony]], and [[tellurium]].<ref>[http://www.pctechguide.com/33CDR-RW_CD-RW.htm Guides/Storage/CD-R/CD-RW – PC Technology Guide] {{webarchive|url=https://web.archive.org/web/20090330222151/http://www.pctechguide.com/33CDR-RW_CD-RW.htm |date=2009-03-30 }}. Pctechguide.com (1999-02-22). Retrieved on 2011-10-09.</ref> Azo dyes were introduced in 1996 and phthalocyanine only began to see wide use in 2002. The type of dye and the material used on the reflective layer on an optical disc may be determined by shining a light through the disc, as different dye and material combinations have different colors.

[[Blu-ray Disc recordable]] discs do not usually use an organic dye recording layer, instead using an inorganic recording layer. Those that do are known as low-to-high (LTH) discs and can be made in existing CD and DVD production lines, but are of lower quality than traditional Blu-ray recordable discs.