Adding a new hard disk

[Bolinga]

Hello,

I recently bought a new (2tb) hard disk, I at first formatted it to fat32 but that wouldent work because its to big for fat32. So I formatted it to ext4.
This works (rather oke) but I can only mount it as root.
Ofcourse I can mount it with a easy command, but I am sharing folders with samba share, and now people cant use it because of the permissions. And I want it to automount so I dont have to switch it on myself all the time.
And besides that, all of a sudden I am missing 300gb when I make a share folder in it.

Any solutions?
To see my fstab and additional info please check:
http://paste.ubuntu.com/594827/

Thank you!!
Bolinga

[Bolinga]

Hmm... no ideas?
No one? :/