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]

You might want to at least consider the possibility of multiple drives or other volume assignments:

#! perl -slw
use strict;

my @vols = split "\n", `diskpart /s listvol.txt`;

print for @vols;
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Where listvoe.txt contains:

list volume
[download]

Will get you the volume list. You can then grep on /ROM/ and tease the line(s) apart to get the volume number.

---

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

"I'd rather go naked than blow up my ass"

Perfect.Good idea to get a safety net. It seems it could be also "DVD" i wonder if "blue ray" e.g. produce another output,
but so far it will work since or new machines only got DVD-ROM drives ...

list volume:
Volume 0     R                       DVD
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Thanks
MH