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WDe and GPT, booting DOS (Users)

posted by Japheth Homepage, Germany (South), 10.11.2022, 17:55

> So, I finally have M$DOS 7.1 installed on a spinning hard drive (which I
> swap with FreeDOS T2211 on a spinning hard drive - using a SATA extension
> cable for ease of access/change). I have never used DOS 71 before (only
> 6.22 and FreeDOS).
I'd like to also have a solution for DOS 6.22, but that version doesn't understand LBA addressing, AFAIK, and that complicates things considerably.


> I attempted your method and I "think" that the 3 sectors of the FAT32
> partition (of approx 2 GByte) have been modified correctly (I hope). Bytes
> from the ORIGINAL 3 sectors (0x0b to 0x59) were manually edited into
> DOS71BSM.bin (keeping DOS71BSG.bin unchanged) - attempted using WDE to
> replace the first 3 sectors with DOS71BSM.bin.
Ok, here's the first mistake - or misunderstanding. The DOS71BSM.bin is the "standard" boot sector set for MBR-partitioned disks ( hence the 'M'-suffix ). It's more or less the "unmodified" DOS 7.1 FAT32 boot sector set - and pretty useless for GPT-partitioned disks ( I removed the creation of that binary in the meantime ). The interesting thing is DOS71BSG.bin ( 'G' for GPT-partitioned disks ), only that version contains the added modification.

> Can you give me some guidance on how to actually perform the grub-mkconfig
> step? - I gather that this may have to be done in LINUX (I am
> learning/using Mint21) - assume that the M$DOS71 hard drive is /dev/sdd
There are ( at least ) 2 possibilities: "grub-mkconfig" or "update-grub". The latter is better because it doesn't need any arguments. Must be run as root, though: "sudo update-grub".

If everything's ok, that program should finally display something like "found DOS/Win31 partition on /dev/sdd'.

---
MS-DOS forever!

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