Skyward Sword is split into several layers of loading precision. There are three main levels:
All Areas and Rooms that share the same map are called a Map. This can be seen when pressing the '+' button. Your coordinates are based off the Map. This means that a BiTWarp (or some other way to change Link's coordinates) can make Link move to Areas and Rooms much further along in the Map, since they share the same Map.
Areas are sub-zones of Maps. Sometimes a Map may contain only one Area (such as Skyview Temple) and some contain several (such as Lanaryu Mining Facility). If you enter a new room, and the screen fades to black or white, then a new Area is being loaded. When the Area is loaded, all the Rooms in the area are partially loaded.
Rooms are generally divided by doors, but not always. For example, all the "rooms" in the Knight's Academy are one large Room. Upon entering a Room, the individual Room is fully loaded. If the Area has not been partially loaded yet, then the room will be unloaded.
Performing a BiTWarp may place you in a different room but in the same Area. If so, the Area is still partially loaded, but you skipped a "Load room fully" trigger (such as a door or a normal file load). Things that are loaded include:
Things that are NOT loaded include:
This means that you can skip past certain barriers while the room is partially loaded. Leaving a room and re-entering it will fully load the room. Alternatively, saving and then reloading the file will also fully load the room.
If you skip past an Area loading zone via a BiTWarp to a different Area, the room will be unloaded. The following are still loaded:
The following are NOT loaded:
As you cannot leave or enter another loading zone, there have been no found uses yet. Unlike a partial load, re-entering a room does not load the room, as you still need to hit an Area loading zone. Saving and reloading also does not load the room. The game thinks you are in a different Area, because you never went past an Area loading zone to update the new Area.
Note: Bird statues are not linked with their respective Maps/Areas/Rooms/Coordinates. They only save Link's current information. There is no event that causes the game to update all of Link's information.