WHAT IS A C1 ERROR? curious

http://club.cdfreaks.com/showthread.php?s=&threadid=65359&highlight=4480B

What’s a C1 error.
Does C1 mean the data was not correctly burnt to the CD and that it might not be 100% correctly burnt? or is it some kind of corrected bad bit and the burn is 100% matching the data on the hard disk?

I’m very curious about this, because if it’s what I think it is, I’m very disapointed.

anyone?