Technically, I get the difference between the two; this is just a usage question.
In particular, I want to move some folders off of a smaller hard drive and onto a larger one, but I need to use some sort of link to do it--the application that uses these files only expects them to be where they currently are, and isn't configurable.
I'm not sure which argument I should pass to mklink: /J or /D. In doing some research on the web, places seem to just pick one or the other without explaining why they made that choice.
The data consists of many small files and folders, which are read and written to quite frequently, if that's something that would affect the decision.