I am looking to do the very same thing. Did you ever find a solution?
No, unfortunately I never got an answer for that, and I posted the issue on several forums...
If you're a more lucky, drop a line here
will do, thanks!
Google Talk: abritez
--- @ WiseStamp
As you've noted, there are new API's to get notification when a drive is mounted/unmounted. Unfortunately, there is no API to directly unmount/eject a drive within AIR. I can see how this would be nice to have given the warning dialog that the Mac OS displays when manually removing a device.