Versions are changing too fast. It was still 2.7 when I downloaded it.

Mount works the first time, but when unmounting, the directory is not or could not be removed from /media. So when the key is mounted once more, the script fails on directory creation.

My understanding is that two possibilities are to be considered:
- The name resolves to empty directory not matching any active mount point. It can be used to mount the device.
- The name is already used in a mount point. Either signal the issue or create a new moint point using a suffix.

Hope it helps (and that a version 0.2.9 is not already availble )

A very nice job anyway.