someone suggest me that for managing permission for accessing the partitions of hard disk you should add users to group and now i have found from askubuntu.com that how to add user to groups.
But i not get the way how to add permissions for users in such a way that they not have access to specific hard disk partition but they have access to other partition without use of admin password?
after mounting partition in admin user when i go to properties and then to permission and their try to change the premissions something like access to files/folder and groups then when i change the groups and going to save it automatically changed to previous setting before i can save?
i am using ubuntu 12.04 LTS
so please tell how to manage the permission for user for access to hard disk partitions?