how does disc space get used up over time and how do i dump those files. i found that safari and quicktime both have caches that can be emptied but still over time hd gets used. where are temp files or swapfiles and can they be empied. i think restart does all this but i like to keep imac on all the time until next update comes out. i have a lot of space but i like to get rid of extra wasted stuff and keep everything runnig at full speed. thanks.