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WDe and GPT, booting DOS (Users)

posted by Richard, 28.12.2022, 09:34

>
> Congratulations! You're now a member of a very elitist club. :-P
>


Pushing the limits (again)


I broke it (again)! :-)




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).


To make better use of the first 2 TB of a 4 TB SATA SSD, and since only ~ 512 GB can be for FAT32 partition on GPT - I used Windows 10 to create an additional FAT32 partition of size 64 MB - the intention to use it only for data/files (not booting).


MS-DOS 7.1 on GPT did not see this extra partition (Dir D:\ gives invalid drive error).


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.

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