[Samba] Basic Read ONly share with admin write access?

[Andy ..]

ok.. so i've had a samba share set up on our network for a while with 
user-level securty and it was working great, but recently there has been the 
need for a share that is accessible to everyone without the authentication 
(mostly a media server [aka a hacked xbox] that can broawse the smb network 
to read avaiable media) this was very easy to implement, but somehow i lost 
the abilty to write from the other machines in the network..

the goal? to make a data share that can be read/writeable for unix user 
admin can access REGAURDLESS of the machine *he* sits at on the network..
And then keep the "public" folder accessible to all without the need for a 
username and password..

this made me think that SHARE-level security would be best.. but i'm still a 
N00b

..heres my conf!

-andy

#======================= Global Settings =======================

[global]
   workgroup = WORKGROUP

   server string =
   security = share


   hosts allow = 192.168.



   invalid users = root

   socket options = TCP_NODELAY


#======================= Share Definitions =======================

[public]
    browsable = yes
    read only = yes
    guest ok = yes
    path = /data/public
[data]
   path = /data
   browseable = yes
   writable = yes
   create mask = 2775
   directory mask = 2775
   username = admin

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