DVD-9 are dual layer, single side (layer 0 and layer 1 on same side) as you should know.
Double layer means swap the disk in real time between layers. Always when the movie or game is playing and need to access layer 1, it takes a couple seconds (max 2 seconds) to change and calibrate the laser beam in order to read that layer.
Someone can just put "insert disc 2" (or side 2) and "press X to continue" screen, when the game needs to access over 4gb barrier, this tip should works perfectly if correctly programmed (hacked). But the same must be for "insert disc 1" (or side 1) as well, when it needs to access layer 0 again.
DVD-5 are 4.38GB
DVD-9 are 7.95GB
DVD-10 are 8.76GB
All values are the real one.
SCPH-39001 v7 GH-022 NTSC U/C, Matrix Infinity v1.93 (installed by me), HDLoader v0.8c, Network Adapter (with SATA mod), 1TB SATA, SMS v2.9R4, VGA and GameLink 400 cables.
DEV1: uLaunchELF v4.42b / DEV2: CodeBreaker 10.1. Got PSX and PS3 too.
Domain for Sale: www.digitalanime.com.br