I have bought 100 Mr-Data CDR's from MACRO, and i inserted a CD in my new RICOH CDRW drive, set it to a minimal speed 4x and tried to copy a file to one of my new CDR's. Normally when i insert a blank CDR, WinXP asks me if i would like to use windows explorer to write to the cd. This has not happened and my computer has not detected a CD in my CDRW. I have bought 50 Gold CD's which are expensive and it works with them Perfect and some BUSH CD's which are quite cheep. £20 for 50 in cases. The CDRW works with all these accept my mr-data CD's. I needed these CD's to mess about with then i dont waste any of my expensive one's. When NERO goes to write to it, my LED on my CDRW doesnt even light up and it doesnt write any data to the CD.

Does anyone know what the problem is?

Thankz all who respond!