Why does my main hard drive fill up when I export a movie?

Hey all,
I set all scratch disks in the preferences to use an external FW800 hd. Still, when I try to export a movie, I see my main hd fill up to maximum capacity and cannot finish the export due to insufficient space. Is there any way for that not to happen?
Thanks,
Zurdyo

With only 3GB available on your boot drive, you are very close to crashing your system. I'm surprised you haven't been experiencing lots of system problems at this point.
A 10-min HD video will indeed utilize 4-5GB of temporary space, especially if you didn't bother to render the video & mixdown the audio before exporting.
In general, you should always keep at least 20% free space on your boot drive (minimum 20GB), preferably more in order to keep your system running well. And if you are working with HD video you really need to keep at least 40-50GB minimum free space on your boot drive.

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