Sorry I went to sleep shortly after my last message
Right click on "G:" > Properties > Security > Advanced > Change Permissions for "everyone" > Select "Everyone and click Edit... > Check boxes "List folder /read data", "Read attributes", "Read extended attributes" "Read permissions" and make sure you have all others unchecked DO NOT CLICK DENY
for anything or you may loose control of your partition completely. denying permissions to "everyone" will override all other permissions settings. Click OK.
Return to the permissions menu > click Add... > You can either type your administrator user name and click "check names" > or click advanced > Find now > search for your administrator user name > click OK
Check the box for "Full control" > click OK
After you see both Everyone, and your administrator account listed in the permissions entries dialog box, check the box for "Replace all child object permissions with inheritable permissions from this object". If you dont, the new set permissions will only be set to the root directory of this partition. So make sure you have this box checked so that all folders and sub folders will have the same permissions.
If you ever wish to go back and add another user with custom permissions (Lets say your spouse, best friend or co-worker you trust), make sure to re-check that box again when your finished. Hope this helps