BAT/CMD file to remove drive letters using DISKPART

Question

I am trying to write a batch file to remove drive letters that are assigned to partitions with no file system. I cannot use wmi since it is being used in a WinPE recovery en

Answer 1

I may have a much simpler solution for you. Just grab the whole line and use batch sub-strings to pull out the right pieces

@echo off
setlocal ENABLEEXTENSIONS ENABLEDELAYEDEXPANSION
    for /f "delims=" %%i in ('^
        echo list volume ^|^
        diskpart ^|^
        findstr Volume ^|^
        findstr /v ^
        /c:"Volume ###  Ltr  Label        Fs     Type        Size     Status     Info"^
       ') do (
        set "line=%%i"
        set letter=!line:~15,1!
        set fs=!line:~32,7!
        if not "       "=="!fs!" (
            if not " "=="!letter!" (
                call :removeVol !letter!
            )
        )
    )
endlocal
exit /b

:removeVol
    (
        echo select volume %1
        echo remove letter %1
    ) | diskpart
exit /b

The for statement produces of listing of volumes without the column headers or separators.

The do statement does the sub-string operations.

Ensure that you have admin privilege for the diskpart command. I am a bit curious about your WinRE environment. Most of the ones I've worked in did have a minimal WMI instance running, as well as WSH which would make this code much cleaner.