getpartitionnumber

REM assumes English

set OSPART=E

set PARTNUM=

for /f "delims=*" %%B in ('^(echo sel vol %OSPART%^&echo list part^)^|diskpart^|FIND "*"') do set LINE=%%B

set PARTNUM=%LINE:~11,1%

echo PARTNUM=%PARTNUM%

==========

REM Get drive letter from partition number (assumes English!)

REM use with delayedexpansion

set PART=2

set DISK=0

set PARTNO=

FOR /F "delims=*" %%B IN ('^( echo SEL DISK %DISK%^&echo SEL PAR %PART%^&echo DET PAR^)^|diskpart^|FIND "*"') DO (

SET Line=%%B

IF NOT "!Line:~14,1!"==" " SET PARTNO=!Line:~14,1!

)