Hard drive space question

I've recently bought a 40G playstation and I've noticed that the hard drive space is 25 G, even when I only have 5G of stuff intalled.

Is this normal?

40G harddrive = 37GB hard drive space available. Blame the HD manufacturers cuz this ain't SONY's fault.

I guess you have a little bit more than 5G stuff though.

But back to your question, yes, this is normal.