中国DOS联盟

WMIC LOGICALDISK WHERE "FILESYSTEM LIKE '%FAT%' AND DRIVETYPE<4" GET NAME,FILESYSTEM,FREESPACE,SIZE

:: LocBak.bat qzwqzw 2007-12-22
:: 定位系统盘与备份盘分区编号与可用盘符
@echo off & setlocal EnableDelayedExpansion
set cmdline=wmic logicaldisk get deviceid,freespace,size ^| find /n "%SystemDrive%"
for /f "tokens=1,3,4 delims=[] " %%i in ('"%cmdline%"') do (
    set /a syspartid=%%i-1
    set freesize=%%j
    set size=%%k
    set /a usedsize=!size:~-12,-6! - !freesize:~-12,-6!
    set /a usedsize=usedsize*1000*3/1048/4
)
echo 系统盘为: %SystemDrive%, 分区号为: %syspartid%, 镜像占用约为: %usedsize% MB.

wmic logicaldisk where "drivetype=3" get DeviceID,FileSystem,FreeSpace > %systemdrive%\_drives.txt
set driveid=-1
set dosdriveid=-1
for /f "tokens=1,2,3" %%i in ('type %systemdrive%\_drives.txt') do (
    set /a driveid+=1
    set filesystem=%%j
    if "!filesystem:~0,3!"=="FAT" (
        set freesize=%%k
        set /a freesize=!freesize:~-12,-6! * 1000 / 1048
        set /a dosdriveid+=1
        if 1!freesize! geq 1%usedsize% (
            set BackupDrive=%%i
            set BackupDriveID=!driveid!
            set BackupDOSDriveID=!dosdriveid!
        )
    )
)
if "%BackupDrive%"=="" echo 未找到符合要求的备份盘 & exit /b 1
set BackupDOSDrive=CDEFGHIJKLM
set BackupDOSDrive=!BackupDOSDrive:~%BackupDOSDriveid%,1!:
echo 备份盘为: %BackupDrive% （DOS：%BackupDOSDrive%）, 分区号为: %BackupDriveID%, 剩余空间约为: %freesize% MB.