HL-DT-ST DVDRRW GWA-4164B which come with my Acer Aspire can’t recognise blank dvd-r and after upgrade firmware to 1.05 it recognise dvd-r BUT only from time to time. No problem in reading previously burnt dvd though.
I don’t think it is media problem as a blank dvd-r which is recognised 5 mins ago can become un-recognise later (or the other way round) Nero, DVD Identifier gave me same result. So far had tried Ritek, CMC, Mitsubishi Chemical Company. Any help is appreciated. Btw I don’t have problem with cdr (write & read).