Hello, I am currently using Macbook Pro Mid 2014 with El Capitan 10.11.6. Lately I've been getting the start up disk almost full messages often. I don't keep account of all the disk space I am using but I feel like I should have a lot more space. I feel like I shouldn't be close to using the 500gb of space. It certainly feels strange. I keep clearing space but it fills up too fast, space that I really can't account for. Just today, about 5 hours ago, I reaceived another message that it was getting full. So I cleared up about 5gb of space. I saved about 60mb worth of files and nothing else but I received another message that my disk was getting full and using at the disk utility I have about 500mb of space left. I am using dropbox and google drive, but looking at the activities, there has not been activities or files downloaded to my computer. Does anyone have any guess as to what is going on? or have any advice for me? I am thinking about reformatting the drive and reinstalling everything. Thank you for your help in advance.