Powershell confirm Drive

Hello,

I am writing a powershell script to copy files.  I do not want these files copied to a local disk or network share. They must be copied to a USB drive. We actually currently have people mistyping the Drive letter and then mucking up other network drives with copied data.

So i do this in powershell:

I want to type the drive letter they gave, lets say E and confirm that E is a USB storage device. Another Device type should error out and ask them for the drive letter again before moving on. 

How can i do this?