hi, I have 2 different CDRW blanks, I recently burned on both of them some of thos boot tools CDs which contain lots of recovery, partition, antivirus, etc. tools. well, after that both programs I use for burning (nero and acohol 120%) stopped recognizaed the cds as rewritables! both of them claim that the cds are not rewritable but they are. any idea why? is it possible that writing certain images to a cdrw makes is not longer rewritable?