I am novice Ubuntu user. For laughs I encrypted an external USB drive and put a punch of secret stuff on it. It used to be that every-time I would attach the drive I would be challenged for a password. At some point I inadvertently clicked "remember password" and now the volume mounts automagically.
How can I remove the cached password so I will be asked for a password each time I mount the volume?
Thanks!
Launch
Password and Encryption Keys
from the Unity dash. Try to find the stored password matching your USB drive, right click and delete it.