How to erase Mountain tiger sytem disk

Big problems with mountain tiger. Can't burn a Blu ray from FCPX on my Pioneer  BD-RW BDR-206M witch working right on Lion.
So I want to get back to Lion and with those downloadable software I can't erase my startup disk.
Please help

You have found the forums for pre-2006 Mac tower computers that cannot run OS 10.7. Can you further identify your model so we can get the hosts to move your question to a more appropriate forum?
And there is no such thing as "Mountain Tiger." There is "Lion" and "Mountain Lion," but no such alpine modifiers for "Tiger" (Mac OS 10.4.11)

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