However, for those that are still in the purchasing consideration stage, here is an overview of the recording times available on a standard 4.7 GB blank DVD and how these recording times are labeled. These times are for single layer, single sided discs. For double-layer, or double sided discs, multiply each time by two:
XP - 1 Hour
SP - 2 Hours
LP - 4 Hours
EP - 6 Hours
SLP - 8 Hours
SEP - 10 Hours
In addition, some DVD recorders also feature HSP (1.5 hours), LSP (2.5 hours), and ESP (3 hours).
Also, keep in mind, just as with VCR recordings, the less recording time you use to fill the disc the better the quality and compatibility with playback on other DVD players.
XP, HSP, SP are the most compatible and provide what is considered standard DVD quality (depending on the quality of the source material)
LSP and LP would be the next best choice - which should still be compatible with playback on most DVD players at fair quality - you may experience some minor stalls or skips.
The remaining record modes should be avoided, if possible, as the video compression needed to place this much time on a disc will cause many more digital artifacts and will affect play compatibility on other DVD players - Also, the video quality would be very poor - about the same or worse than the VHS EP/SLP modes.
For more details on DVD recording times, check out my FAQ, also titled: Home Much Time Can I Record on a DVD?.
In addition, for more complete information on DVD recorders and DVD recording, check out my DVD Recorder FAQs.