Here's something strange

I just finished burning a disc but it turned out to be unreadable.
When I examined the disc (Richojpnr02) I noticed a clearly visible ring about 1mm wide and about 8 or 9mm from the centre of the disc that looks like it is unburnt.
Second time it has happened to me lately, can’t remember whether it was a Richo the other time though.
Has anyone else experienced this?

There has been instances of this, on and off, going way back, but nobody has really found the cause of it. See [post=630130]this post[/post] back in July. It may be of some help…