I am trying to write a CD-R on my 2003 aluminium G4 Powerbook (UJ-816 DVD drive) and got this message: the disk can't be burned, because the device failed to calibrate the laser power level for this medium I tried 2 different "imation" CDs, same result. I have never seen this issue / message before. has anyone else seen this ? Is it software, my drive or the CD? regards, Trevor