DVD-R discs are
recordable DVD media that can be written to only
once. The discs can be writen in standard DVD writer
drives. The DVD-R format was developed by Pioneer
in 1997 and is the most commonly used type of writable
DVD (other types include DVD+R and the re-writable
DVD-RW/DVD+RW).
DVD-R discs have
much higher storage capacities than CD-R discs by
using smaller pit sizes and narrower track pitches
in the spiral groove that runs around the
discs. These smaller pits and grooves require a different
wavelength of laser light (650nm) to that used in CD drives (780nm) and therefore DVD discs cannot be read
in standard CD drives.
The DVD-R discs
are available in two main sizes of circular diameter
12cm and 8cm. The 12cm discs are the typical size
for CDs and DVDs and have a capacity of 4.7GB and
the 8cm discs have a capacity of 1.4GB.
DVD-R discs are
made from two 0.6mm polycarbonate layers that are
bonded to each other. One of the layers contains
a grooved reflective surface and a recording dye
(hence the slightly green/blue colouring of DVD-R
discs when compared to replicated
discs). The other layer is just clear and is
used to create the required disc thickness of 1.2mm.
Below is a diagram
illustrating the difference in track pitch between
CDs and DVDs:
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Print and burn your own CDs and DVDs by buying the blank discs, labels and packaging from our online store, including our unique and unusual business card size discs, mini 8cm circular discs, coloured CDs and vinyl-effect CDs in the style of old records.
