I'm using a 64 GB MBA and recently purchased Daisy Disk from the Apple Store to free space on the SSD. I've noticed that while Daisy Disk will show all folders and files it will only delete my own files----items that are within the system it will not delete. I know there are some folders and files that shouldn't be touched, but there is a folder containing close to 5 GBs of small "keychain" files, which I can't seem to delete. Do I really need these files? I observed on the Daisy Disk video that if you buy from DD directly you can enter yourself as the administrator, but you don't have that option with the Apple Store version----is this a factor? Thanks for your help once again.