There are three factions battling for supremacy in the format war. Pioneer is advocating DVD-R and -RW (where R means recordable and RW means re-writeable), Philips is championing DVD+R and +RW, and Panasonic is pushing DVD-Ram. Each format has its merits and drawbacks. DVD-R/RW offers better compatibility with older players but limited functionality in editing. DVD+ R/RW boasts greater functionality, but is not quite as widely compatible. And DVD-Ram offers the best functionality but falls short on compatibility. To complicate matters, a VR (video recording) mode was introduced to extend the flexibility of DVD-RW, but cannot be read by with most existing DVD players. The good news is that more DVD recorders are sporting hard disk drives, on which material can be recorded and extensively edited before being transferred to DVD. This means it will not matter which format you use. Compatibility will not be much of a dilemma either, as all DVD recorders can record to either DVD-R or DVD+R, both of which are widely accepted.