Expect double-layer, almost double-capacity DVD+R drives and media to hit the stores next April, members of the DVD+RW alliance say. The technology, co-developed by drive maker Philips, and media specialists Verbatim and Mitsubishi Kagaku, adds a second recording layer to a standard-thickness DVD+R disc, taking the medium's capacity from 4.7GB to 8.5GB.

That's enough for four hours of DVD-quality material, 16 hours of VHS-quality content or two hours' archive footage. The discs are playback-compatible with existing DVD players and DVD-ROM drives.

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