Well, if you select the hard disk's icon from the desktop, you can right-click or press Cmd-I to see how full it is. But if you're suddenly getting this message, then something fairly rapidly filled your computer. Here are culprits:
1) If you are using any kind of video editing software (iMovie, FCP, etc), occasionally people report that they somehow end up with a 40 gig movie file or something they didn't realize they created.
2) Ditto for audio editing software.
3) The next major possibility is that Limewire is doing this to you -- so go through the folders where it puts files and make sure you don't for some reason have a lot more files than you thought.
4) Otherwise the likely culprit is that a log file or a swap file caused this. In this case, the easiest to explain way to deal with this is to get Onyx and use it to clear caches and logs.
help would be needed greatly and greatly appriciated.
