http://www.computerhope.com/issues/ch000854.htm

These commands may require Windows Vista and newer versons of Windows.

Using WMI:

wmic logicaldisk get name

or, even better:

wmic logicaldisk get caption,providername,drivetype,volumename

Assuming you are on windows 7 or have installed Powershell:

gwmi win32_LogicalDisk -filter DriveType=4