After an easy installation, OmniDiskSweeper for Mac presented us with a list of hard drives attached to our test machine, and we selected the internal 500GB drive. A new window appeared that populated with a list of folders and files, with their respective sizes listed right next to the name. The full sweep completed in under five minutes. The largest folders top the list with sizes color-coded: gigabytes in purple, megabytes in dark blue, and kilobytes in green. From there it was easy to drill down into each folder, zeroing in on the largest and most useless of files. In another five minutes we had freed up over 45GB of space. Remnant DMG files in our Downloads folder automatically saved, but unneeded Mail attachments, and old documents all unwittingly took up space. We were also able to identify another 25GB of files and folders that will need further scrutiny before we delete them for good.