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Fail to understand the enthusiam for dual layer - at $13 plus per disk it is cheaper to buy the discounted originals.
Information below from PC World - 21 MAY 2004
Verbatim Spins Out Dual-Layer DVD+R Discs
Discs pack almost twice the capacity of predecessors, work with most current drives
The first dual-layer DVD+R recording media are set to go on sale in Japan at the end of this month and in the U.S. in June, says disc maker Mitsubishi Kagaku Media. The discs offer 8.5GB of recording space compared to the 4.7GB of space available on a standard DVD+R disc.
They will cost around $13.30 per disc in Japan, said a spokeswoman for the company.
How It Works
As the name suggests, the extra recording capacity is made possible through the addition of a second recording layer inside the disc. To make it possible for a single laser to access both recording layers, one behind the other, the top layer has been made semi-transparent. That allows enough reflectivity for data storage and playback while also allowing light to pass through to the second layer.
Similar technology is already in use in commercial DVD-Video discs and so is supported by almost all DVD drives currently on the market. The dual-layer discs should be compatible with any drive that supports these discs, according to Mitsubishi Kagaku.
Going for Drives
Recording drives supporting the new media are already on sale.
Sony launched both the internal DRU-700A and external DRX-700UL drives in Japan, the United States, and Europe in May. The drives support dual-layer DVD+R recording at 2.4X and also writing of single-layer DVD+/-R at 8X, DVD+/-RW at 4X, CD-R at 40X, and CD-RW at 24X. Philips also showed a drive at the Cebit electronics fair in Hanover, Germany, in March. The DVDR1640K drive supports up to 16X recording on single-layer DVD+R discs and 4X recording on DVD+RW discs.
An alternative to dual-layer technology is double-sided discs. These offer double the storage space at 9.4GB but require the user to take out and flip over the disc to gain access to the second side. Such discs are already on the market.
Source: PC World
Martyn Williams, IDG News Service
Friday, May 21, 2004
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