Hello, I'm just starting to learn to use FCPX after years with FCP 5,6,7. I want to edit a some 7D H264 footage. I can see that FCPX will edit H264 natively. So is there any point in optimising media? From what I can see optimising media creates a copy of the original footage (why?) and a Pro Res version. I did optimising media and then tried to delete my original footage but this crashed FCPX. I don't mind optimising media and then usign the PRo Res footage to edit with. But I should be able to delete the original H264 footage no? I don't want to keep it otherwise I'm going to run out of disk space really quickly. Thanks.