Windows only: If you're looking to quickly get a snapshot of which folders and files are eating up your disk space, Primitive File Size Chart can help. We've covered other tools that help you see where your disk space is going, but it's tough to beat the portable application Primitive File Size Chart for speed. You point it at a disk or directory, tell it how many files and folders you want listed, and it takes care of the rest. Results were returned within seconds even when scanning a packed 1TB disk. Primitive File Size Chart doesn't have any fancy bells or whistles but it will give you the path, file name, and size of your largest files making short work out of assessing what is filling up your disks. Primitive File Size Chart is freeware, Windows only.