You can right-click My Computer and press Manage to use the Removable Storage snap-in to find out, or you can run PhysicalMedia.bat.

PhysicalMedia.bat uses the RSM command to write a file containing the media labels and associated GUIDs.

The syntax is:

PhysicalMedia OutputFileName

PhysicalMedia.bat contains:

@echo off
setlocal
if {%1}
{} goto syntax
set file=%1
if NOT {%2}
{} goto syntax
if not exist %~dp1 goto syntax
if exist %file% del /q %file%
If exist %temp%\PhysicalMedia.tmp del /q %temp%\PhysicalMedia.tmp
for /f "Skip=2 Tokens=*" %%i in ('rsm view /tphysical_media /guiddisplay') do set line=%%i&call :sortin 
sort %temp%\PhysicalMedia.tmp /o %file%
del /q %temp%\PhysicalMedia.tmp
endlocal
goto :EOF
:syntax
@echo PhysicalMedia OutputFileName
endlocal
goto :EOF
:sortin
if "%line%" EQU "The command completed successfully." goto :EOF
@echo %line%>>%temp%\PhysicalMedia.tmp