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An optical disc is designed to support one of three recording types: read-only (e.g.: CD and CD-ROM), recordable (write-once, e.g. CD-R), or re-recordable (rewritable, e.g. CD-RW). Write-once optical discs commonly have an organic dye (may also be a (Phthalocyanine) Azo dye, mainly used by Verbatim, or an oxonol dye, used by Fujifilm [4 ...
PSI Media and Fulfillment Services; Pandisk Technologies [20] Philips; Plasmon Data Systems (Defunct in late 1990's) [21] Prodisc; Pressing-Media www.pressing-media.com; PrimeDisc [22] Princo Corp [23] (seems to have stopped, as of 2020 they no longer appear on their home page) [24]
ISO/IEC 26925:2009, Data interchange on 120 mm and 80 mm optical disk using +RW HS format -- Capacity: 4,7 Gbytes and 1,46 Gbytes per side (recording speed 8X) ISO/IEC 29642:2009, Data interchange on 120 mm and 80 mm optical disk using +RW DL format -- Capacity: 8,55 Gbytes and 2,66 Gbytes per side (recording speed 2,4X)
Rewritable media can, with suitable hardware, be re-written up to 100 000 times. The CD-RW is based on phase change technology, with a degree of reflection at 15–25%, [6] compared to 40–70% for CD-R discs. [6] The properties of the medium and the write and erase procedure is defined in the Orange Book Part III.
Although research into optical data storage has been ongoing for many decades, the first popular system was CD, introduced in 1982, adapted from audio to data storage (the CD-ROM format) with the 1985 Yellow Book, and re-adapted as the first mass market optical storage medium with CD-R and CD-RW in 1988.
For rewritable CD-RW, DVD-RW, DVD+RW, DVD-RAM, or BD-RE media, the laser is used to melt a crystalline metal alloy in the recording layer of the disc. Depending on the amount of power applied, the substance may be allowed to melt back (change the phase back) into crystalline form or left in an amorphous form, enabling marks of varying ...
CMC produces CD and DVD storage media products, including CD-R, CD-RW, DVD-R/RW, DVD+R/RW, DVD-RAM, and floppy diskettes.CMC produces the Mr. Data line of optical media, which is or was commonly rebranded and sold by HP, Maxprint, Imation, Memorex, Philips, TDK, BenQ, Verbatim Life Series, Staples, Office Depot, Datamax, Optimum, Auchan and other OEM brands.
The preservation of optical media is essential because it is a resource in libraries, and stores audio, video, and computer data. While optical discs are generally more reliable and durable than older media types, (magnetic tape, LPs and other records) environmental conditions and/or poor handling can result in lost information.