To the reviews addressing the slowness of the program: I think the age and RAM of your system also applies to how fast this program will take. It is only 11.3 MBs. I got this file sweeper through a deal and so far I am pleased. I've used it twice so far. It takes about an hour or so to sweep through 1TB of storage that I have but it does a very thorough job. I have an hour to spare because I just set it up and go do other stuff. I have reviewed each file that this program has picked up and they are indeed duplicates. It has so far saved me 50GB of space. I tend to download multiple files because of my unorganized mac (and downloading the same files for school over and over again). Overall, I am happy with it. Yes, it does take some time but unless you're a heart surgeon and these files are pretinent, I think you can spare an hour for a job well done. Other file sweepers most likely just compare name and file size. Whereas this algorithm uses other measures. So until this thing asks me to delete a file that is not a duplicate, I am keeping this 5-star review as is lol