I have the same problem with my SONY MVC-CD300. A buzzing noise when you first turn it on and then the disc error message C:13:01. I've had the camera for 4 1/2 years and it has worked flawlessly until about 6 month ago when this problem started and it happens quite often. I do use the SONY Mavica CD-RW discs. What is causing this and how do I go about getting it repaired? Thank you, Armand Olevano