How to Create folder from PLSQL command window using sql during spool

Question

I have tried HOST MKDIR os command from my spool code and folder is not creating from windows location. Please help.

Below are some snipper tried.

HOST MKDIR 'DDL'
HOST MKDIR DDL
HOST MKDIR &foldaer_name
HOST MKDIR "DDL"
! MKDIR 'DDL'
$ MKDIR 'DDL'

Expecting the folder should be created in provided windows location.