Yeah, I don't have a 3DO but I've heard good things about TDK. It should be noted though that some "TDK" discs aren't actually made by TDK. What do your discs look like, and does the package say they were made in Taiwan?
Yeah TDKs work great in my Goldy too.

I found out today that the genero Imations [Primaris] work good too. I was a touch sketchy about 'em 'cause they was #### cheap - I got a gang of 'em @ $0.19 each.

Check previous posts for other Gold friendly brands.
They work great in every time console ever made, even the xbox. i would make love to them if i could, but their reflection layer really lays me off...