CD/DVD-R vs CD/DVD-RW
Posted 05 July 2008 - 06:06 AM
Posted 05 July 2008 - 11:58 AM
From the below website.
Both CD-R and CD-RW discs have the same basic structure but with significant detail differences. The CD-R disc has a dye-based recording layer, with a reflectivity of 40 - 70 %, while the CD-RW disc has a phase-change recording layer with a reflectivity of 15 - 25 %. Both discs have an additional reflecting layer: golden for the CD-R, which accounts for that disc's distinctive appearance, and silver (aluminium) for the CD-RW.
The main physical difference between CDR or CD-RW disc types and the standard prerecorded CD (audio or CD-ROM) is that the latter has no recording layer; the information is permanently stamped in the aluminium reflecting layer. This makes the disk much stronger.
From the TDK website.
CD-RW disc's phase change recording layer has achieved high sensitivity and a wide power margin. It also boasts outstanding characteristics in terms of its resistance to moisture and oxidation, as well as heat stability. The protective layer is composed of a type of resin material that is subjected to UV (ultraviolet) curing to give excellent weather resistance. The protective layer safeguards the recording and reflective layers from heat and moisture. This gives the CD-RW disc the ability to maintain its stable characteristics while utilised for repeated recording and playback in a wide variety of environments, ensuring long term protection of data.
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