From: g4sra <g4sra@???>
Date: Sat, 13 Sep 2025 07:52:12 +0000
> ... you are looking in the wrong place, this is for the benefit of CSM
> (grub-pc) not EFI, not GPT :)

Thanks for the tip. Found mention here.
https://en.wikipedia.org/wiki/GNU_GRUB#Version_2_(GRUB_2)

"Recent operating systems suggest a 1 MiB gap here for alignment (2047
512-byte, or 255 4KiB, sectors)."

Thx,                         ... P.

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