How to mount second hard drive without a password

[johnnyboy5000]

I have a second hard drive in this pc and I'd like it to be mounted on start up.  currently it's there, greyed out and I have to double click it and "authentication is required to mount". I know there is a preference/option to not have to authenticate, I did it once before, but I forgot what I did. Where is that option to have the hard drive to be mounted at start up?  Thanks.