@echo off
for /f "skip=1 tokens=2" %%a in ('dir f:\') do (set "str=%%a"&goto :out)
:out
echo %str%
pause

for /f "tokens=2" %a in ('dir^|findstr "序列号是"') do echo %a

@echo off
for /f "skip=1 tokens=2" %%a in ('vol f:') do echo %%a
pause

@echo off
for /f "tokens=2 delims==" %%a in ('wmic logicaldisk where "name='f:'" get 
volumeserialnumber /value') do echo %%a
pause