获取最大容量盘符

!include "FileFunc.nsh"
!include "LogicLib.nsh"

OutFile "Demo.exe"
SilentInstall silent

Section
  ;查找所有硬盘驱动器(HDD)
  ${GetDrives} "HDD" "FindHDD"
  MessageBox MB_OK "最大可用空间驱动器盘符：$R2"
SectionEnd

Function "FindHDD"
  ;获取查找到的驱动器盘符($9)可用空间(/D=F)单位兆(/S=M)
  ${DriveSpace} $9 "/D=F /S=M" $R0
  ${If} $R0 > $R1
    StrCpy $R1 $R0
    StrCpy $R2 $9
  ${EndIf}
  Push $0
FunctionEnd