LG GSA-4167B - Manual (Page 23)

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The differences of DVD-R/RW, DVD+R/RW discs and DVD-ROM
1. Recording Layer
LPP
(Land Pre-Pit)
DVD+R/RW Disc
DVD-R/RW Disc
0.74
um
3T
0.4 um
DVD-ROM (Read Only Disc)