Please help. When exporting a 720p video using Quicktime Conversion in FCP it saves some extra temporary files to my computer. The file is called ICMMultiPassStorage. This file gets so large that eventually the program and exporting process crashes.

Please help. When exporting a 720p video using Quicktime Conversion in FCP it saves some extra temporary files to my computer. The temporary file it saves is called ICMMultiPassStorage. This file gets so large that eventually the program and exporting process crashes. I have been able to locate the file using GrandPerspective and close out of FCP to delete it. But when I try exporting the movie again it creates the ICMMultiPassStorage file again. I have made sure my scratch disks are set to my external hard drive so I know that isn't the issue. How do I fix this problem so these temporary files are not being stored on my internal hard drive instead of my external?Thanks!