why my Mac disk size become zero while Mac running long time? While my my Mac starts, it shows about 2GB free size but after running about 5-6 hours, I use Firefox and other apps at that time, then only leave the FF running (not close), other apps also in stop working mode I think. I close my Mac not shutdown. I do this because I am lazy to reboot my mac ... after about 5-6 hours, Mac report my disk size is full. I am confuse by this, anyone also face this type problem before? 

My Mac is Mac OS X v 10.6.8.
A lot of temporary files and pages of virtual memory were paged to RAM. I know this could take up quite a bit of space, so it's non impossible that it used up the last few gigabytes with those processes open.