NEC 1300A can´t write to CD-RW

My NEC ND-1300A can’t write to any CD-RW.
I can read and play them. But not write to them.
If I have a CD-RW in the drive and check the disk-info with NERO or DVDInfoPro, it says that the media is not writeable. It says it’s a CD-R.
I have tried both FUJI and Verbatim media for High Speed drives (which 1300A is?) without any luck.
I have tried several NEC frimware versions as well. I have now the latest 1.0B.
Otherwise the drive function as supposed to.
Any hints how this problem can be solved?
Kris Persson, Sweden.