Stick Mount - what am I doing wrong?

view story

http://forum.xda-developers.com – Last night I unlocked the boot loader and rooted my Nexus 7. Today I installed Stick Mount and plugged in a 500GB WD external hard drive. The drive powered up fine and Stick Mount appeared to mount it successfully. What confused me was unmounting it. When I selected unmount, it came up still listing the drive as an active mount. I was expecting it to say no devices or something like that if it unmounted. To make things easier, I selected a 4GB Kingston flash drive. I formatted it to EXT4 on my Ubuntu 12.04 laptop and then utilized that on my Nexus 7. The same thing happened. It appeared to not (HowTos)