Hi Frank!<p>As far as I am aware, CD-RW can only be burnt in a CD-RW burner. The depth of the burning for CD-R and CD-RW is different.<p>I know in theory it sounds plausable that a CD-R burner could do CD-RW on a write but not erase, but the CD-RWs have another wavelength on the laser.<p>Also try again make sure your burning slow. Very fastest CD-RWs I have are x10, where I can do X16 on CD-R. Most CD-RWs are normally only max of X4.<p>Hope that helps?