Write speeds are generally faster for DVD+RW than DVD-RW because it always employs VBR encoding.
DVD-R and DVD+RW have recently become options, but DVD-RW does not appear to be supported.
A manufacturer of DVD-R/RW drives, Andy Parsons, vice president of Product Development, Pioneer Electronics, recently speculated that DVD-R discs are compatible with 90 to 95 percent of the latest batch of DVD players, while DVD-RW discs are only compatible with 70 percent of these players.
Sonic reports, even though DVD+RW drives are not supported by the DVD Forum, "the DVD+RW drives read DVD-ROMs and CDs, and usually read DVD-RW and DVD-R discs; but they can't read or write DVD-RAM discs .
This could be an especially thorny problem for Roxio because, while DVD-RAM has been targeted at jukebox vendors and "power" users, Pioneer is targeting DVD-RW
at "home" users, which are Roxio's targets too (remember those friendly skins and MP3s).
But there's no question that, compared to DVD-RAM media, DVD-RW media will more nearly resemble the replicated disks that today's DVD-ROM and DVD-Video drives "expect" to read.
A DVD-RW drive for PCs was still only a prototype when Niimi and Parsons spoke with me in September.