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WDe and GPT, booting DOS (Users)

posted by Japheth Homepage, Germany (South), 27.10.2022, 16:41

> Are you willing to do a public release of this "hack"? It would be very
> useful to many of us who want to boot DOS on GPT partitions. I think limit
> on such GPT paritions recognized by DOS 7.1 will still be hard-limit of
> 2048 GiB, correct?
The problem with making such low-level stuff public is that it's only useful for people who know exactly what they are doing. If interested, I can send you a copy via PM.

The code is an assembly program, size 3-sectors ( containing the FAT boot sector, the "file system info" sector and the "second" boot sector ). But you cannot just write it to the HD, you have to adjust the BPB at offset 11 in the first boot sector ( fields "hidden sectors", "size", "sectors/fat" ... ).

And yes, partition size is - of course - limited to 2 TB. Worse, the partition has to be located in the first 2 TB of the HD ( this could be "fixed", but requires a "permanently" modified int 13h handler, something I wanted to avoid [ besides the fact that I simply don't own a HD with size > 2 TB ] ).

---
MS-DOS forever!

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