Is there a bug with the 'Drive' column view or am I being stupid?

I have a 2 drive player and was curious to see what files were residing on the 2nd drive. I enabled the 'Drive' column under the 'View' menu and no matter what files I list, the drive column always reports '0'.
I have performed searches that return ~3000 files and at no time have I seen anything listed other than Drive 0.