My coworker and I both have the same version of Illustratir (CS6) and both use Lion on iMacs, but today noticed something weird. He saved a file similar to a file I had done before as both an eps and a pdf and his file size was more than twice what my file sizes usually are. I thought it was odd, so I copied everything from his file into a new file (same dimensions) and saved out an eps and pdf (default settings), and like I thought, my files were less than half the size of his.
Why would two machines be saving identical files at different sizes? Is there a setting somewhere I'm missing? Everything in the file is vector, if it matters. There's not even any editable text.
See the mechanism of saving here: http://superuser.com/questions/66825/what-is-the-difference-between-si ze-and-size-on-disk
The size of the "blocks" depends on the size of the disk and how it's been formatted.
In that case I would be deeply worried about the result.
Illustrator doesn't cooperate well with servers. And if both computers save a different file size, it could point to problems. Big ones like data loss and such.
You might want to tell us the complete story in your first post next time you have a question.