Forums | MacLife

Ok,
so I posted something on here a few weeks ago about poor computer performance, and the problem is deeply rooted in me not having much HD space free at all times.  I immediately trashed a bunch of stuff and was sitting pretty(by relative comparison) at over 3 GB free.  I know this is not enough still, but heres my problem:

It seems my HD space just disappears without me doing anything.  Sometimes all 3 gigs of it.  I am 99% certain i've installed/downloaded NOTHING over 10 mb since cracking down on this space.  Now, I'm sitting at 1.63 gb available, AFTER a restart, that was preceded by me cleaning out many Caches using Onyx.  I figured this shuold be where all my space is hiding, but alas, tis not. 

Does anyone know where my space is going?  I know its probably being used well by something important, but Im doing my best to trash things I don't need, and I seem to be fighting an uphill battle.

Also, I have used sound studio before, and have had hour long recordings that I have not saved.  The program crashes before I can do anything with it.  I am worried this file is in purgatory somewhere in my harddrive but can't find where it would be.

Any help appreciated, thanks.