@echo off
for %%a in (c d e f g h i j k l m n o p q r s t u v w x y z) do (
  for /f "tokens=3*" %%h in ('vol %%a: 2^>nul^|find "驱动器"') do (
    if "%%i"=="D^F" set "DrvU=%%a"&goto :11
  )
)
:11
echo,%DrvU%
pause
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@echo off

set "DrvU="

for %%d in (c d e f g h i j k l m n o p q r s t u v w x y z) do (
    if exist %%d: (
        for /f "tokens=1-3,*" %%1 in (' vol %%d: ') do (
            if "%%1" == "驱动器" (
                if "%%4" == "D^F" set "DrvU=%%d" & goto :Next
            )
        )
    )
)

:Next
if defined DrvU (
    echo %DrvU%
) else (
    echo 未找到相应卷标
)

pause
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