My Mac OSX is coming up with error message when i try to write a disc "The disc can't be burned because the disc drive is not accessible (error code 0x80020020)." Same also when I tried my external disc writer-any clues?

My Mac OSX (version 10.7.5) is coming up with error message when I try to write a disc "The disc can’t be burned because the disc drive is not accessible (error code 0x80020020)." I have tried several discs with the same message - Same also when I tried my external disc writer. Both disc drives will read my discs that have music or photos on it, it just won't write any new discs - any clues?

Hi Klaus1
So, I tried all the suggestions and followed the links - all to no avail.
as you can see, (screenshot below) my iMac is a 21.5 inch late 2009 model which isn't showing in the updates listed above
My system report shows that my Mac has the following:
I reset the PRAM and the SMC - still have the same error message when I try to burn discs. I've used both CD's and DVD's and tried with my external Discwriter too.
Any further suggestions??

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