Thak wroteI just check this morning and "permission" on my hdd seems to be lock on "none"... And i can't change them with my ubuntu machine, i will try with a windows one later today to change them.
If music is the only thing you have on the drive, you could give read/write permissions to Everyone with chmod in terminal:
sudo chmod -R 777 /path to drive
If there are other important files there, you could use:
sudo chmod 646 /path to drive
Obviously, you would want to change /path to drive with your drive path to the external drive on the machine.
You should also be able to change permissions via gui with nautilus (assuming you are using the default file manager) by running Nautilus as root from terminal first:
sudo nautilus
Windows will definitely do it for you I just thought the Ubuntu stuff would be helpful.