apang

@echo off
set size=3221225472
wmic LogicalDisk where (DeviceID="C:") get Size /value>%temp%\a.txt
for /f "tokens=2 delims==" %%a in ('type %temp%\a.txt') do (
if "%%a" gtr "%size%" (echo 大于3GB) else (if "%%a" lss "%size%" (echo 小于3GB) else echo 等于3GB)
del %temp%\a.txt
)
pause
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