How CLOB stored in Teradata database

Database

How CLOB stored in Teradata database

Q1 How CLOB is stored in the teradata database?

Suppose If A Table is created with CLOB and Non_CLOB columns. And defines the CLOB as 2GB while table creation. And insert the data equivalent to Varchar(6) .i.e' School' in CLOB column. Will this  reserve the entire 2G space for CLOB column or would acts like Varchar(6). i.e the amount of data stored  inserted in the CLOB colum.