Founded in 1997 by HP, Philips, Sony and others, it developed the DVD+RW specification as an evolution of the CD-RW format. The Alliance was formed to provide a format that was more compatible ...

In contrast, a "portable DVD player" is a self ... may play only the minus group (DVD-R, DVD-RW). DVD players may also read and write DVD-RAM discs, but compatibility between brands is not guaranteed.

CD-RW - meaning CD-ReWritable, the CD can be written and re-written to. Unlike multi-session discs, existing data can be overwritten. DVD-ROMs - read only, the data is written to them before they ...