I have a 27' iMac and myself and a group are making a documentary using this computer. We have uploaded countless interviews and it is taking up a bunch of space. I only have around 40 min. left of uploaded space. Also, I keep getting the 'startup disk is full' message on my computer. We still have many more interviews to upload. Does anyone have any suggestions, recommendations on how I should go about getting new space for my computer? Please help me with this. Thank You.