DVD is an optical disc storage format which has been slowly replaced by Blu ray format. For those who do not know, DVD sands for Digital Versatile Disc or digital Video Disc.  

DVD stores approximately six times more data than CDs. Because of the next generation HD formats coming up now, DVD are sometimes referred to as SD DVD (standard definition DVD). HD DVDs or High definition DVD is on longer available as Blu ray Disc has replaced them all. For writing on DVD, red color laser beam is used, the wave length of which is in the range of 650 nm. Since it uses 650 nm wavelength light, it allows for a more precise etching on the surface, thus compressing the data more and increasing the recording capacity. .

DVD-R and DVD+R can only record data once and then it can only be read but not written. Single layer DVD has recording space of about 4.7 GB. The other type of disc is dual layer DVD. Dual Layer is a technology which permits 8.5 GB storing space on DVD+R disc. With Dual Layer (DL) technology, two recordable layers are obtained on a single sided DVD disc. For this type of recording, Dual layer DVD enabled burner and dual layer DVD media should be used. Dual layer is also referred to as double layer and it is written as DVD+R DL and DVD-R DL on the DVD media. The recording speed of dual layer media is lower than those offered by single layer media. DVD-RW, DVD+RW, DVD-RAM are re- writeable. You can record and erase the data any number of times on these discs.  

Most people remember Verbatim because of floppies, though it it is a known name in data storage business. Verbatim DVD media is acknowledged for compatibility, high speed disc performance and reliability.  For archiving home videos, Verbatim offers dual layer DVD discs and good quality. Verbatim DVD R DL doubles the storage capacity. It has two Azo recording layers on single sided DVD discs. It stores around 8.5 GB of video and is compatible with most DVD players and drives. This storage means up to 4 hours of video. Verbatim DVD R DL (plus) comes in recording speeds of 2.4 X and 8 X. it has a range of disc surfaces like inkjet or thermal printable. You can get standard, which is 12 cm, or mini camcorder discs which is 8 cm type. Verbatim DVD R DL (minus) is a standard 8.5 GB disc with recording speed of 2X- 4X.

Caitlina Fuller is a freelance writer. Single layer DVD has recording space of about 4.7 GB. The other type of disc is dual layer DVD. Dual Layer is a technology which permits 8.5 GB storing space on DVD+R disc. You can get standard, which is 12 cm, or mini camcorder discs which is 8 cm type. Verbatim DVD R DL (minus) is a standard 8.5 GB disc with recording speed of 2X- 4X.

Article Source:http://www.articlesbase.com/hardware-articles/dual-layer-dvd-technology-1009376.html

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