as of yesterday, whenever i boot up my macbook i get a message saying "system disk full-you must delete files" is this just as simple as deleting rarely or unused files from the hd? i dont know what i have on there thats taking up so much space.... i write a lot of poetry and have about 200 pictures saved (which sounds like a drop in the bucket to me) should i put them on my external drive and delete them from my comp all together? anyone have any space saving tips or ideas? input appreciated thanks!!