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WDe and GPT, booting DOS (Users)

posted by Japheth Homepage, Germany (South), 28.12.2022, 12:05

> So, it appears that I have discovered the upper size limit of a FAT32 GPT
> bootable DOS partition (which is smaller than the general Windows 10, paid
> partition tools and Wiki FAT32 partitions on GPT - all seem to have
> different but larger values).
Would be interesting to see if MS-DOS on a MBR-partitioned disk also has this 512 GB limit.

> MS-DOS 7.1 on GPT did not see this extra partition (Dir D:\ gives invalid
> drive error).
Yes, this isn't surprising. See one of the first posts:

> However, just the boot partition is detected and used ... to detect further
> FAT partitions ( including the "EFI system partition" ) would need more.
Would actually need a little device driver.


> I then attempted to use WDE to modify the first 1536 bytes of the 64 MB
> partition (along the lines of making the partition bootable) - but WDE
> crashed.
I agree, a divide error isn't very nice - perhaps this should be fixed...

---
MS-DOS forever!

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