which media type: DVD vs. Mini- dvd,+ or -?!?

Grrr... I'm using Sony Mini DVD-RWs and the qoob bios won't even recognize that there's media in the drive...

 

I have used 2x and 8x TDK DVD-R like stevetex (I only burn at 1x or 2x). I haven't used them on Gamecube yet (my modchip is in the mail), but they have worked flawlessly for the 15 PS2 burns.

The 8x TDK DVD-R are on sale at Circuit City right now, they sell 25-pack for $9.99 (the label in my store says this is up until 8/23).
fyi, CC's 50-packs are not on sale and are 39.99.

To compare, I used Ritek Ridata for PS2 game too, and got 2 bad burns out of 10 on my Pioneer burner. Other people seem to have had better results than me though.