[数值计算] 批处理用powershell换算硬盘容量的函数，怎么再优化一下

hnfeng

写了个根据数值（硬盘容量），换算为适当单位（TB，GB，MG，KB，B），显示更直观。
但是不熟悉powershell，感觉函数部分应该能再优化一个
请高手帮忙

@echo off&setlocal EnableDelayedExpansion&cd /d "%~dp0"&title %~nx0
 
echo  磁盘 	   剩余	 总大小
for /f "tokens=1,2,3 delims= " %%a in ('wmic logicaldisk get Caption^,Size^,FreeSpace ^|findstr [0-9] ') do (
  rem echo %%a	%%b	%%c
  call :getTGMK %%b Size
  set "Size=       !Size!"
  set Size=!Size:~-7!
  call :getTGMK %%c FreeSpace
  set "FreeSpace=       !FreeSpace!"
  set FreeSpace=!FreeSpace:~-7!
  echo   %%a	!Size!	!FreeSpace!
)
 
echo;&pause
exit
 
 
:getTGMK
setlocal
set S=000000000000000000%1
set S=%S:~-18%
if "%S%" GEQ "000001099511627776" (
  for /f %%c in ('powershell -c "[Math]::Truncate(%1/1099511627776)"') do (endlocal & set %2=%%cTB&goto :EOF)
  ) else (
  if "%S%" GEQ "000000001073741824" (
    for /f %%c in ('powershell -c "[Math]::Truncate(%1/1073741824)"') do (endlocal & set %2=%%cGB&goto :EOF)
    ) else (
    if "%S%" GEQ "000000000001048576" (
      for /f %%c in ('powershell -c "[Math]::Truncate(%1/1048576)"') do (endlocal & set %2=%%cMB&goto :EOF)
      ) else (
      if "%S%" GEQ "000000000000001024" (
        for /f %%c in ('powershell -c "[Math]::Truncate(%1/1024)"') do (endlocal & set %2=%%cKB&goto :EOF)
        ) else (
        endlocal & set %2=%1B&goto :EOF
))))
goto :EOFCOPY

[img][/img]