Isaac wrote:

The symptoms you describe can result from either a bad hardware or bad
media. If you are sure it isn't the media then it's time to look at the
hardware.

Maybe your hardware is just dirty, and cleaning it will help. Maybe
your laser is getting weak and you'll have to buy a new cd burner.

Thanks, but I still can't believe this, since the drive is
only a 3/4 year old and as it worked fine until the
re-installation.

Best regards
Lars