Under Windows OS, the original SD files are stored in the "core libraries" folder. What about on the Mac? I see a libraries folder under Documents->Arduino but I cannot find the folder that stores the SD files.
You can get to the SD library folder by:
- File > Examples > SD > Cardinfo
- Sketch > Show sketch folder
This will open the .../libraries/SD/examples/CardInfo folder. The SD library source files are in the SD folder.