Well, here's how I roll ..
On laptop I use the PGMusic supplied USB drive to save the drive space used for Realtracks and Drums etc.

On desktop, I have a drive dedicated to be a copy of the PGMusic USB drive (faster and I have the drive slots, so why not? As OM mentioned, drives are pretty cheap).

To move a project between computers I use my internal network or a thumb drive (depending on the need).
BiaB files are pretty small, but Realband files can get pretty large.

Drive names below are pretty self explanatory.
I am lucky enough to be a beta tester, so my BB drive (E:) is fuller than it needs to be as I have yet to clean it up after beta this year. Plus I keep some older versions around for testing.

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I do not work here, but the benefits are still awesome
Make your sound your own!