Quick question here about error rates on the CD burn. IF you guys validate your CD after copying, what error rates do you get? What error rates are 'acceptable' (will give successful upgrade)?

It doesn't seem to matter what CD manufacturer I use or what CD burner (tried 2) or what source for the V27, V28 or v29.1 software, I cannot get better than an image showing 3 sectors in error with each of those sectors having 3 errors.
Imgburn validation log tells me that there is probably a difference in the validation because the source file is wrong and Imgburn has 'corrected' those errors in its copy.
Did anyone manage to burn a CD with 0 validation errors?? I could try the upgrade with one of the CDs I have but if it goes wrong I cannot get back to a previous version, since I can never burn a 100% error-free disk, so my nav would be totally ****** unless/until I went to the $dealer!

Thanks for any tips.