When I am editing with After Effects CS4, my remaining disk space goes down, then when I quit off AE, it slowly goes back up again. Why does it do this? And is there a way to use my external HD's disk space instead of my computer's?
This is because by default your system drive is used as a 'scratch disk' - i.e. temporary storage while your working. I'm not terribly familar with After Effects, but in Photoshop you can choose which disks (and in which order) are used as Scratch under the system preferences (under performance).
If After Effects is anything like other adobe stuff like Photoshop, it could well be making massive temp files. I know Photoshop can guzzle gigabytes in one sitting.
There was a time when you had to manually sweep your hard-drive for that garbage with monotonous regularity.
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