you need to have a nice 6.1 GB on your hard drive with at least 1 extra GB for custom content and saved games so you're looking at 7 GB for PC and Mac.
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the sims 2 is a couple of GB but not nearly as much as the Sims 3 is
The Sims 3 is almost 6GB. An extra 1 GB is recommended to be available on the hard-drive for saved games. Depending on the expansion pack, the size may vary.
less than 1GB
the sims 2 University takes up 944 MB of space
4.25 GB or so i believe but i know is around 4 GB