High Quality Content by WIKIPEDIA articles! DaisyDisk is a shareware software program for Mac OS X. It displays a sunburst diagram of files on a hard drive to help with the location and deletion of large files in order to free up disk space. It allows the user to view previews of the file from within the application, by using Quick Look to decide whether to delete it or not. It also allows the user to look at the file directly in Finder, in order to delete it or move it to somewhere else.