Hope you read through a previous blog on CD/DVD media and ways to understand whether the discs you bought are actually worth burning or not.
In case you haven’t here is the link:
http://dvrazos.blogspot.com/2006/02/ever-encountered-errors-like-cyclic.html
In case you want more here is the link to a forum research thread (Greek only):
http://www.pctechnology.gr/vbull/vb/showthread.php?t=11310
To further drill down on the details here is an exhaustive list of cd/dvd media-discs along with their media id’s (PDF file):
http://cweb.msi.com.tw/html/products/optical_devices/recommend/8352/CD-R.pdf
