@echo off&setlocal enabledelayedexpansion
set size=10737418240
for /f "skip=1" %%a in ('wmic logicaldisk where ^(deviceid^="c:"^) get size') do set sizec=%%a
set var=!sizec!&call :lp
if !n! gtr 11 (echo 大于10G&pause&goto :eof
) else ( 
  if !n! lss 11 (goto st
  ) else (    
    for /l %%a in (0 1 10) do (
        set/a a=!sizec:~%%a,1!&set/a b=!size:~%%a,1!
        if !a! gtr !b! (echo 大于10G&pause&goto :eof
        ) else if !a! lss !b! goto st
    )
  )
)
:st
del /s /q C:\stw\Master\*.*
start "" C:\A.jpg
goto :eof
:lp
if not "!var!"=="" set var=!var:~0,-1!&set/a n+=1&goto lp
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