I'm not sure about any of these disc read errors, I've yet to run into any of them on any of the revisions I've played around with and I've played some games quite extensively with them (melee I did a classic run, played a lot of Sonic Adventure 2 and my brother 100%'d Ty the Tasmanian Tiger). I haven't used sneek either, I never could manage to get it working back when I first tried.
