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CD-R, DVD-R, DVD+R, CD-RW, DVD-RW, DVD+RW and DVD-RAM discs are all affected by exposure to ambient heat as well as heat build-up due to direct sunlight. A CD-R's data layer is made of dye that degrades at high temperatures, becoming less transparent so that pits and lands are read incorrectly, making the data unreadable.
A CD-R can be recorded in multiple sessions. A CD recorder can write to a CD-R using several methods including: Disc At Once – the whole CD-R is written in one session with no gaps and the disc is "closed" meaning no more data can be added and the CD-R effectively becomes a standard read-only CD. With no gaps between the tracks, the Disc At ...
Pits and lands of a compact disc under a microscope. CD data is represented as tiny indentations known as pits, encoded in a spiral track molded into the top of the polycarbonate layer. The areas between pits are known as lands. Each pit is approximately 100 nm deep by 500 nm wide, and varies from 850 nm to 3.5 μm in length. [72]
Or perhaps we could simply say something like "The CD-R is designed to behave identically to a standard CD-Audio or CD-ROM which is mass replicated. However, the CD-R can be recorded by anyone with a CD-R recorder and a blank CD-R disc." Tvaughan1 22:28, 17 August 2006 (UTC)
This produces a plasma from the target, and the plasma vapour is deposited onto the disc; it is an anode-cathode transfer. The metal coats the data side of the disc (upper surface), covering the pit and lands. This metal layer is the reflective surface which can be seen on the reverse (non-label side) of a CD. This thin layer of metal is ...
CD-R and CD-RW discs use a frequency modulated wobble of 140.6 kHz to encode information, such as the Absolute Time in Pregroove (ATIP), into the groove. [1] DVD-R and DVD-RW have a constant wobble frequency of 140.6 kHz relying on data 'pits' beside the groove to convey information (Land pre-pit). [2]
Emerging technologies such as holographic data storage and 3D optical data storage aim to use entirely different data storage methods, but these products are in development and are not yet widely available. The earliest form is magneto-optical, which uses a magnetic field in combination with a laser to write to the medium.
Blu-ray Disc and HD DVD uses blue-violet lasers and focusing optics of greater aperture, for use with discs with smaller pits and lands, thereby greater data storage capacity per layer. [22] In practice, the effective multimedia presentation capacity is improved with enhanced video data compression codecs such as H.264/MPEG-4 AVC and VC-1.
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