Before you create a Sandbox, you should see how big you'll need it to be. You can do so by creating it on a larger-than-necessary external partition.
Note that many of the iLife applications store a lot of data in the global /Library. These can considerably increase the size of a Sandbox. You can elect to share much of their Application Support files -- see the User's Guide for the steps.
You want around 15-20% free space for temporary and swap files...
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--Dave Nanian
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