In my Lightroom 5 Library module of I have no Folders displayed in my C: although there are actually 12,971 folders containing 27,612 files on that drive. Can you assist?
LR is not a File Manager. It is a Database program. The only drives and folders displayed in the "Folders" area of the Library module are ones you have imported images from.
The only time LR displays all drives connected to your computer is when you have the Import dialog window open. That is so you can choose which drive letter you want to browse to import images from.