Re: question about hard drive storage

i do plan on only have a selection of games but that selection is still pretty high. i will start with a 10TB HD and hope that's enough for everything up to ps2/GC

You can comfortably fit every non-disc system up to the DS in less than one TB. The disc-based systems are where it gets tricky since discs can hold so much data and it's still difficult to compress due to the vast amount of CD-quality audio that's been included since the days of the PlayStation. For disc games, unless you want to try your hand at making a Vimm-level server full of them, you should stick to a curated selection rather than a complete library for now.