All of the software for our personality cores are stored ...
community.lambdageneration.com
Supposedly there exists something called a “DVD”, which holds 4.7 gigabytes, according to our engineers. Mr. Johnson will be reviewing the request to buy several of these in bulk, as they’re the same price as floppies but more efficient. That means we’ll only need 1 DVD per personality core.
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I like how this would mean that the personalities are either designed in an extraoridinarily efficient way, or that they are merely a couple lines of "if"s and "then"s in coding, both possibilities are equally likely with Aperture Science.