不支持32位以上的字符批處理計算磁盤空間怎樣以GB為單位

@echo off
rem write to log
set filename=磁盤空間日志.log
echo -------------------這是一條沒有感情的分割線------------------------- >>%filename%
echo Start >>%filename%
echo (%date% %time%) >>%filename%
net use O: 192.168.0.127127d Kovn /user:administrator
net use P: 192.168.0.128128d Kovn /user:administrator
net use Q: 192.168.0.130130d Kovn /user:administrator
setlocal enabledelayedexpansion
:Main
cls
set /a num2=1024*1024
for %%i 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 %%i: (
set num3_str=
set num4=
for /f tokens=3 %%j in ('dir /-c %%i:') do set num1=%%j
if not !num1!==0 (
call :loop
for /f delims=0 tokens= %%k in (!num3_str!) do set num3_str=%%k
echo.
echo %%i 盤剩余空間為 !num3_str! MB
echo %%i !num3_str! MB >>%filename%
echo.
)
)
)
)
net use O: /delete /y
net use P: /delete /y
net use Q: /delete /y
pause
goto Main
:loop
:: 求商
set /a num3=%num4%%num1:~0,1%/%num2%
:: 求商序列
set num3_str=%num3_str%%num3%
:: 求余
set /a num4=%num4%%num1:~0,1%%%%num2%
if %num4% equ 0 set num4=
set num1=%num1:~1%
if not %num1%== goto loop
goto :eof
echo End >>%filename%
echo (%date% %time%) >>%filename%
nclick="copycode($('code0'));">復(fù)制代碼

怎么才能使導(dǎo)出的文件單位是G呢？不支持32位以上的字符，能不能曲線救國？通過其他辦法解決一下