Test System / HDD requirements

I am researching the possibility of replacing our current OPAC system with another, open-source solution. So far, SOPAC seems to be by far the best solution for our needs. However, if it is all right, I would like a few questions answered before I, as the saying goes, "take the plunge."

First of all, your system requirements list only RAM and CPU for hardware requirements. Assuming that the final system would be on a similar scale as that used by the Ann Arbor District Library or another institution with a significantly large catalog, what is the recommended size for the hard disk in an initial test environment?

Secondly, is it safe to assume that performance would be significantly improved by using an internal mySQL server (rather than connecting to another server on a physically separate machine)? This also relates to the first question, since the tables take up a significant amount of space.

Thank you,
Daniel A.

Never mind: I configured my system to use two different partitions on the same drive, mysql and all, and the partition that houses both mysql and sphinx should be more than large enough for the task.

I'm quite surprised how easy everything is to set up. Guess it's no wonder that Drupal is among the greatest CMS's on the planet, and open-source to boot!

Daniel A.