I was reading the iFixit website's guide for installing 2 drives in late 2012 MM, and the associated comments of people insisting that it does matter the position of the factory drive in order to prevent the MM from thinking the 2 drives aren't a broken Fusion Drive. In the comments was also a link to the OWC website where it also insists that you can't your Disk Utility thru the normal apps location, because of the same issue with the MM believing your 2 drives are a broken Fusion Drive. To tell you the truth, after reading these, it made me feel terrified at the thought of adding a second drive (1 ssd and 1 hdd). Are these experiences true of fellow readers here or flukes? Is there any tried and true info I need to do this? I want to make a bootable USB key. I have the instructions to do that. I'm aware I need to make this copy from the MM so I have a MM version of Mavericks. I'll buy the install kit from iFixit. And of course will be extra careful on the tear down. But does drive location matter at all, or the method of getting disk utility up and running to format the drives? Any tips or things which would make this easier would be great. 1 last thing...I don't have a monitor, mouse, keyboard yet. Can I connect to my tv as a monitor and use and cheap keyboard/mouse via USB?