[crispy]

Hi there mate.
Although I don't use NERO (CDRWin is better for PSX as the files it creates on your HD are those used when patching games, and use CloneCD for PC if your burner is supported) I'm pretty sure that you're getting confused.
"Ignore errors" is not a speed issue. It should be set to ON or OFF. This is because the Safedisk protection (version 1) uses unreadable areas as it's protection mechanism because a lot of burners will automatically correct them thus leaving you with an imperfect copy.
So, set your write speed to a healthy 2x, set "ignore errors" to ON in the read section, and try that.
Any further probs, post again giving your burner model and we'll have another go for yer!!

GOOD LUCK.................