I've been using these Philips Mini DVD-Rs from Amazon and have yet to run into a problem: https://www.amazon.com/gp/product/B000M ... UTF8&psc=1

Definitely looking forward to new drive emulators coming out. Just getting into Gamecube myself and have a XenoGC I installed, but would love an ODE so I don't have to keep burning mini DVD-R discs. Heh.