gid problem

["mr.linux" <mr linux flashnet it>]

Hi, 

I tried to give my user the permission of writing to a vfat partition 
(applying gid) but I think I made a mess ...... and obviously it doesn't
work. 


Can you explain me, in details,  howto? 


This is my configuration: 

user name is: host_user 
shared vfat: /dev/hda2 



What book,or guide or tutorial,  can I read to find infos related to 
system administration? 

Thanks for your help 

Massimo