I'm familiar with manually installing certain files. In this case, I am installing rEFInd Boot Manager, see http://www.rodsbooks.com/refind/installing.html
Yet when manually installing software on Mac OS X, I often run across directions instructing users to choose between installing "on the ESP" or installing "to an ordinary HFS+ volume". This is a good example.
I've never noticed a difference between the two installation methods. So, what difference do the two different installation methods make? Maybe I don't understand the difference between HFS Plus and EFI, so this could be a very stupid question.