Kernel Error Present

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http://forums.fedoraforum.org – I have seen this error in System Mail lately. I'm using F11 32bit. Code: WARNING:  Kernel Errors Present     Buffer I/O error on device sr0, l ...:  4 Time(s)     end_request: I/O error, dev sr0, sector ...:  4 Time(s) device sr0 is my dvd/cd drive...why would it have kernel errors? AFAIK, it's working normal. What exactly does it mean? I wonder if this could be part of my system freezing problems? Thnx. (HowTos)