troubleshooting missing disk space

I seem to have something running on my computer that is eating up all my
disk space, and I can't figure out what it is. Does someone have any ideas
as to how to determine where it's going? Between about 12 and 5 I seem to
have lost about 6% of a 7 GB drive somewhere...

Thanks

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Lucas Vogel
Exponent, Inc.
lvogel@exponent.com
623-587-6739    work
623-587-4191    cell
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http://www.exponent.com