What could be causing a massive temporary decrease in HDD space? When I do a reboot I have around 10gbs left on the OSX partition, but after a few days I end up with 1gb. If I reboot then it goes back to 10. I mostly just use Chrome, along with lightweight apps like QT, VLC, iTunes. Quitting those apps doesnt free up much space. I also sleep the computer a lot. Is there a way to tell what app is using up so much space? Or is there a bug that isnt deleting temporary files until restart?