How can I determine if a given drive letter is a local, mapped, or USB drive?

Question

Given the letter of a drive, how can I determine what type of drive it is?

For example, whether E:\\ is a USB drive, a network drive or a local hard drive.

Answer 1

DriveType shows SUBSTed drives also as DriveType.Fixed.

To check if a drive is substed I use the code How to determine if a directory path was SUBST'd.