This message comes up if you are trying to use a harddisk connected to same ide cable as writer or using cdrom on at same time as burning.
To prevent "coasters"
1. Have HDD and burner on sepeatr ide channles i.e. HDDas prim ide master + burner as sec ide master.
2. Disable screen savers and power management while burning.
3. Do not use computer for any other progs while burning.