Using a Mac Pro. Just got 2 WD Blacks 6TB and put them in RAID 0 solely for my iMovie library for this 4K project. It will consist of importing appx 20 100gb 4K videos into iMovie. iMovie does a great job of editing 4K footage but I've run into a problem with this large project. The first video is 160gb. It imported quickly. However, the render files are still generating. They are at 660gb and counting (on top of the 160gb for the file itself). I can budget 1TB per video and grab 2 more HDDs and add them to the RAID array. But I'm worried even 24TB might not be enough. I know the render files can be deleted but that hurts editing performance. Any solutions for saving disk space without losing performance?