That depends on which users you want to have write access to it. As it stands, you've got it set so only root can create file/directories on it.
If you just want your user to be able to write to it then all you need to do is:
Code:
chown youruserid:users /media/disk-1
You'll need to be root to use chown like this.
If you want to do anything more advanced than that then now would be a good time to read up on how to manage UNIX file permissions. You're going to need to understand it anyway if you intend to use linux for any length of time.