Screenshot of Database Configuration Assistant, Step 7 of 8: Database Storage

The window has two panes. The left pane is a directory tree. The root 
directory is Storage. Its subdirectories are Controlfile, Tablespaces, Datafiles,
Rollback Segments, and Redo Log Groups.

The right pane is all text, titled "Database Storage":
"From the Database Storage page, you can specify storage parameters 
for the database creation. This page displays a tree listing and summary 
view (multi-column lists) to allow you to change and view the following objects:

Controlfiles
Tablespaces
Datafiles
Rollback Segments
Redo Log Groups

From any object type folder, click Add to create a new object. To delete an object, 
select the specific object from within the object type folder and click Remove.

Important: If you select a seed database template, you will not be able to add or 
remove datafiles, tablespaces, or rollback segments. Selecting a seed template
allows you to only change the following:

The name of the database
Destination of the datafiles
Controlfiles or log groups"

At the bottom of the window are eight buttons: Add, Remove, File Location Variables..., 
Cancel, Help, Back, Next, and Finish.