two HDDs over cifs with 1 user and authentication

[meiersas]

Hello @ all

first sry for my bad english, but its not my first language :(

I have succesfuly installed FreeNAS on my machine with 2x 3TB Western Digital HDD´s and i use each HDD alone, no stripping, no mirroring and so on.
Now i have two CIFS Shares one called HDD1 and the other HDD2. each wich 2,7 TB ( 3TB HDD )

A User namend meiersas also exist, but i can only chosse one Homedir ( actually /mnt/HDD1 ) but who can i select HDD2 ?
/mnt/ as a homedir dont work to get access to both HDD´s

again sry for my english, i hope you understand my problem

best regards