The whole root, system partition, sdcard thing confuse me. As you will see I am a total noob in this area so please bear with me and hopefully someone will educate me. I have heard some people talking about moving their applications to sdcard to save space in the system partition (is that the correct term?). I do not know what that means so I decided to see for myself, and gained root access in my Nexus 7. Browsing the folder structure, I am completely lost because I have no idea which is which. I tried to draw what I am trying to learn about; 1. /sdcard/ (along with /root/ directory and other system-level directory) 2. /storage/emulated/0/ 3. /storage/emulated/legacy/ 4. /storage/sdcard0/ Prior to root access, I believe I was looking at #2, which would be /storage/emulated/0/. That's where I saw some application folders as well as data folders. Upon gaining root access, however, I found three more folders that seem to contain identical contents.. I suppose they are not duplicates (four copies of everything?), but I am terribly confused. My questions (for now): - What are these 4 for? And which one is "real" in a physical sense? (does it even make sense to refer it as "real" instead of "shortcuts" or "aliases"?) - Which one is the system partition, or ROM? Are they referring to the same thing? - Which one is "external storage"? Do "external storage" and "sdcard" mean the same thing? And which is "internal storage"? - When people talk about moving stuff to sdcard (e.g. "app to sdcard"), which one is the starting point and which one is the end point? Obviously appreciated.