You have a nice, decent sized 20GB hard drive in your new iMac… but you notice that only 10GB is left! Yes, you did install a number of programs- but not 10GB worth. Or you may have an old Performa with a 1GB hard drive and find you only have 50MB left.
What happened to all that space? Well, the truth is that you probably have many duplicate files on your hard drive. How many? It’s hard to say, but there are a few common things to look for.
Almost every application installs a copy to make sure that you can read the included “ReadMe” file. You probably don’t even use the one copy of SimpleText that came installed on your computer! Use Find File or Sherlock to search for “SimpleText” and delete all but one copy.