Mount permissions on disk

[Daniel Johansson]

Hello, I'm sorry if this is a dumb question but I can't find the answer 
anywhere. I've tried both google and searching the mailing list.

Anyway what I would like to know is how I change permissions on a mount. 
I've got a new disk and I would like to mount it with the permission 775 
so that my user, in wheel, can write to the root of the disk too.

If I remember correctly in 4.x all you had to do was to set 775 on the 
dir you use as mount point but in FreeBSD 6.1 this doesn't seem to work.

So is there any other way I can set 775 as permission on my mount?