Sony RDR-GX7 Technical Notes page 6

Basic physical construction
of a recordable DVD disc
Differences in physical construction
6
Pit
DVD-ROM
Pit
Track pitch: 0.74 m Track pitch: 0.74 m
"Track pitch is the same, which means high compatibility with DVD players"
Wobble
Land Groove
Wobbled Groove
DVD-RW/-R DVD+RW/+R
land pre-pits
(LPP)
Track pitch: 0.74 m
Wobbled Land Groove
DVD-RAM
Address
area
Track pitch: 0.615 m