Update README.md

data/README.md

@@ -1,6 +1,9 @@
-# data
+# Data
 
-If the path to your data on your computer is `/Volumes/Passport/fmri_data`, then you can
-create a symbolic link via:
+This directory contains two important subdirectories: `raw/` and `processed/`. `raw` will house raw data files that will be fetched when running `make data` from the top level project directory. `raw` should expect to be filled with approximately 37.5 GBs of data. `processed/` will house files processed and generated by native project scripts. `processed/` should expect to be filled with approximately 190 GBs of data.
 
-    $ ln -s /Volumes/Passport/fmri_data raw
+If you want the data to instead be stored on another drive, delete `raw` and `processed` with `mkdir raw && mkdir processed` and instead create symbolic links with those names to the path you want your data to be located at. For example, if you want your raw data to be located at `/Volumes/Passport/fmri_data/raw`, then you can create a symbolic link via:
+
+    $ ln -s /Volumes/Passport/raw raw
+
+and analogously for `processed`