Hello, First of all, I am new to this whole industry. Please forgive my ignorance. I am looking at replacing the optical drive in my MacBook Pro 13" with a Samsung 840 120GB SSD. I am getting into HD video editing and I want my system to run as fast as I can get it without having to buy a whole new computer. So my question is this: would it be better to run my OS and editing applications on the SSD and leave my media on my HDD that has a rotational rate of 5400 or would it be better to move my media files to the SSD along with the OS and applications during editing? Also, as a side question: is 120GB enough space to have both my OS and all my applications work well or should I go for a 200-250GB SSD?