hi, I just got my TDK DVDRW1612DLB (OEM SOHW-1653S) with firmware: C7S3. I tried to burn with 4x DVD-R (MID Code:VDSPMSAB 01), but failed and showed the "illegal disc" error message. I have Lite-On SOHW-1653S (f/w:CS0G) as well, and it burns perfectly, without showing any error message. What is the problem? Can anyone tell? Thanks.