Messed up with permissions for USB and other volumes

[abelito8]

HI,

While doing some experiments with my partitions I must have messed up something and I am unable to mount or unmount USB devices graphically, it simply says I have not the permission...

Apart from playing with pysdm settings, the only bad thing I did was to change the permissions....(suggestion from another forum)

$ sudo chmod -R 777 /Data
sudo chown -R fred:fred /Data

How can I change them back so that I can use GUI also to mount and unmount
thank you

[Leppie]

what settings did you exactly play with in pysdm?
do you remember which exact usb device you had plugged in when playing with pysdm?
have you tried several usb devices?
could you post the output of the following command:

groups

[abelito8]

I was with my external HDD but (hopefully) I did not do anything with it. I think it is a general problem for if I plug in another USB, it says

You are not privileged to mount the volume "name"

this is the result of the command

abel@ernesto:~$ groups
abel adm dialout cdrom plugdev lpadmin admin sambashare

and if I go to the starting login and do chmod -R 777 ?