I'm still running Lion since upgrading is usually takes time for me and I remember hearing something about not being able to use nested folders in Mountain Lion I didn't look more into it at the time, but I was wondering if this is true? The way I have my Mac Pro set up, I have a Boot drive which has the OS/Apps and I have 2 Data drives that hole all my files. My files on my data drive are split up like so: /Data/Music /Data/Pictures /Data/Documents /Data/Downloads /Data/Videos And in those folders its organized to be broken down a bit more by events. Would this type of structure be impossible with Mountain Lion? And finally, if the above is possible in Mountain Lion, then what is it that changed with the filesystem?