Why does the burner ejects the blank disc automatically and pop up this error "it is not writable" ?
Error "it is not writable", normally indicate that something is wrong with the blank media.
It is probably a drive/media compatibility problem too. You may try different kinds of blank discs or use another writer/burner to have a try.
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1. At the top left, open the Apple menu. 2. Select About This Mac. 3. In the "Overview" tab, look for "Processor" or "Chip". 4. Check if it says "Intel" or "Apple".