It's likely to be an issue with some api call - and I don't feel like going through all the code for such non-issue.
![Stick Out Tongue](https://oss.azurewebsites.net/forum/images/smilies/tongue.png)
Mounting root of drive is always a bad idea, and should be avoided.
Possible work-around: create a file called .ioFTPD.dummy to the root of each drive.