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WDe and GPT, booting DOS (Users)

posted by Richard, 28.11.2022, 13:18

>
> I'm not sure how WDe behaves if a drive is larger than 2 TB. That's why I'd
> suggest to try DOS71BSG on a disk < 2 TB first, if possible.




I have just tried your "GPT modification recipe" on a wiped 750 GB spinning hard drive.







>
> Then I would, as a first step, search the FAT32 boot partition on the
> GPT-partitioned disk with WDe and check that the bootsectors are indeed
> what they should be.


It appears that the boot sectors are what they should be according to your recipe. I tried to use WDe 1.0 to save the modified DOS71BSG.BIN into the FAT32 partition (of the GPT style Disk) - but that did not work for me - so I CLONED the modified DOS71 FAT32 (on MBR style Disk) to the (GPT style disk).




Booting up from (GPT style disk) via GRUB produces the errors :-

no such drive EC01-CEA4
can't find command 'drivemap'
hd1,gpt2 not found



Note that Mint Cinnamon 21 was installed after the cloning above was done - and Mint 21 created the GRUB Menu (and grub-update automatically).





The MSDOS71 on the (MBR style disk) - being modified by the recipe to GPT - appears to function as if nothing was changed. I would have thought that changing it to GPT would prevent it from working (on a MBR style disk).



How did everyone else manage to get booting from GPT style disk???



It appears that WDe 1.0 is not reading the GPT style disk correctly. For instance, I cannot seem to see the FAT32 partition (with modified first 3 sectors) in WDe correctly. WDe appears to read the MBR style disk correctly.

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