WiiNews:2007-07-31 - Dual Layer DVD Test Tool
From Dev-Scene
Team CycloWiz has released a tool to test DVD-DL compatibility.
We've made a simple test program to help us in that task: it checks if both the first and the second layer of a dual layer disc could be read. You can also find it in the support section, burn it on a regular DVD+/-R disc
The laser power may have to be tuned before beeing able to read DVD+R DL media (as with DVD-RW media). Less than 50% of test Wii we have can read those discs without any tuning. There is a variable resistor on the optical pickup head itself, that needs to be lowered. In our tests, the original value was typically around 700-800 Ohm, and we had to lower it to around 500 Ohm, but this might be different on each drive. Just make sure you don't go below 50 Ohm or so.
By the way, the test tool is not CycloWiz specific and can be used to test any modchip, it'd be interesting to see which ones are DL compatible. As of today, all of the commercial Wii games are released on single-layer discs, but the drive firmware supports dual layer discs.