I guessed as much about UDMA 3... . My Dell BIOS is pretty user friendly you just press F2 on bootup and it guides you through any options you want to change. As for the burning, I have noticed a strange thing on some discs during the process:
1 - it starts off at 4x
2 -around 1/3 way through up to 6x
3 - 3/4 way through it goes to 8x
To be honest, please, I haven't got round to defragging yet I need to do some more research before delving into modding , although I'm sure its much better than stock.
I suspect the burning isn't a problem here, but I will check a disc later with the Test Drive Tool in case.
It won't let me re-up the txt files even though I renamed em..(?!). Anyway, you probably don't need to see it now...
thanks for the heads-up on that.