Thx. That was it. Since DVD/CD Drives seem to be volume 0 it is as simple as:
diskpart /s script.txt

script.txt:
select volume=0
assign letter=R
list volume

[download]

Thanks
MH
You saved my day ...

In reply to Re^4: How to change the drive letter for a CD/DVD drive on Windows? by matze77
in thread How to change the drive letter for a CD/DVD drive on Windows <b>Update: with a script</b>? by matze77

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