Windows folder-mounted disks not recognized as disks

Sonarr version (exact version): 3.0.6.1196
OS: Windows 10
Description of issue:
A disk mounted to a folder (instead of a letter) is perceived as a folder.
For example, a large disk is mounted to C:\Mounts\Media and there is a root folder of C:\Mounts\Media\Library\Shows. Drive statistics for C: will be shown rather than for “Media”.

Thanks!