Maybe have a look and see what is using up all this space. If you have a lot of 
iTunes or Video it makes sense that your space is all used up. But if you don't 
it could simply be a run-away log file which filled up your drive.

Running the following commands in Terminal should show you what is using up the 
space:

polaris:~ alex$ sudo bash
bash-3.2# cd /
bash-3.2# du -sh *
3.6G    Applications
...

This will print a list of all the directories in the root folder of your hard 
drive including the size. For example my Applications folder is 3.6GB. 
If you not sure what is normal post your output.

Alex



On 22 Mar 2011, at 10:08, gary dorn wrote:

> 
> Howdy
> 
> My MacPro 2.66, 3GB RAM, Mac OS 10.5.8 ,  a 500 GB harddisk , says it has 
> only 17Gb left.
> 
> In the past week, its been getting spinning ball of death, which meant I have 
> had to force restart.
> Usually occurs when I have a number of Pages, Numbers and PDFs open and I go 
> to open a 3D imaging software ( google earth, BoA etc)
> 
> Is this a sign I need to get another Hard disk?
> 
> thanks
> -- 
> gary dorn
> north perth
> 
> 
> 
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