Hard Times with Hard Drives

So, I've just bought two new hardrives, one for my 80g PS3 and one for my shiny new 4g Xbox360. The PS3 transfer went well (with a little help of my tech-ier friends). Maybe because I'm computer illiterate, but the whole gigabyte thing has no real meaning to mean, 1, 10, 100 I have no way to accurately measure it, what can I do with a gigabyte? When the consoles were offering different numbers of these mysterious quantities I had no idea what they'd be used for. I imagined them as internal memory cards. I had no concept of what we'd be able to do with these consoles, DLC that wasn't just a new outfit, Netflix, downloadable games, games that saved part of themselves on my hard drive. Wow.

So now I have what seems like exorbitant numbers of these miles of possibilities, I hope it's enough.

And the Xbox scares me a bit, so cross your fingers and hope I don't lose anything or destroy my fragile console.