Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
There are many ways. One would be to open Activity Monitor in /Applications/Utilities and look at the graph in the bottom (assuming you choose the correct tab).
 
Or if you want to see on your Desktop, click on the Desktop and press CMD+J to bring up the view options for the Desktop then tick "Show Item Info".

You can follow this guide to get rid off the "free" bit at the end of the free space info for hard drives so it shows all of the free space instead of "...3GB's".
 
dam i just got my mac and didn't put anything on it besides 9gb of music and it's a 250gb hd and all i have left is 190gb that's weird
 
dam i just got my mac and didn't put anything on it besides 9gb of music and it's a 250gb hd and all i have left is 190gb that's weird

no it really isnt

the os take up quite a bit of space and hd manufactuers advertise 1000 KB per MB when really, its 1024KB per MB as the computer deals in binary
 
Well, OS X is "made to just work" so they include quite a lot of useless drivers and such. So when I got my new mac, I simply reinstalled it while opting out some of the drivers that I'd never use.

Besides, 250GB doesn't mean you'll actually have 250GB. You'll need to take out about 5GB's, even upto 10GB if you have a crappy drive. lol.

Anyways, congrats on your purchase and enjoy your new mac 😀
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.