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Custom variables in FOR loop - is this possible?

Hi everybody,
first I should tell WHY I need this.

I want to execute a routine on each partition I have, but these may vary
from time to time, e. g. network drives which have a letter assigned, etc.

-- begin code --

set d3=C
set d4=D

for /D %%d in (%d3 %d4) do call :extroutine %%d %%1
goto :quit

:extroutine
echo.
echo Doing something
echo.
:end

:quit

-- end --

My plan is to have a variable for EACH partition which, on change of setup,
I could simply set empty (set %d<number>= ) to avoid ugly "Drive not
found"
messages.
But apparently FOR does not accept variables in the (set).

For example:

set d3=C
set d4
set d5=E

would (or should) get transformed from

for /D %%d in (%d3 %d4 %d5) do call :extroutine %%d %%1

to

for /D %%d in (C E) do call :extroutine %%d %%1

How could I do this?
It would also be OK to have an external file read out in which the valid
drive letters are listed.

-Andreas

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