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WDe and GPT, booting DOS (Users)

posted by Japheth Homepage, Germany (South), 09.12.2022, 05:10

> My computers x64 were newer than about 2014 - all have UEFI and Legacy.
>
> With people who successfully achieved DOS on GPT - how does it compare to
> my system?
Your system is fine. What do you fear? That it's too old or new? So long as you can access your GPT-partitioned disk with WDe, it's ok.

> The 300GB MBR disk has the following partitions
> C: 516MB (label MBR_D71)
> D: 297GB (label MBR_data)
Why is C: so small? It's FAT32, but using CHS addressing mode, AFAICS ( partition type 0Bh then ) - thus it's restricted to be located on the first 8 GB of a disk.

> The recipe to modify the MBR partition follows the instructions given by
> Japheth
With "MBR partition" you probably mean "the ( first ) FAT32 partition on the MBR-partitioned disk"?

Well, here's a little problem. In my "recipe" I didn't mention to modify anything on a "MBR partition" ( using your wording here ). All HD editing was supposed to be done on the "GPT-partitioned" disk only. Actually, there's no need at all to even access your disk 0 ( the "MBR disk" ) with WDe.

Since you modified your disk 0, your system finally refused to boot. Not really surprising, and no big issue; it's "part of the business" if fumbling around with a disk editor - IMO there's no learning without a bit of pain.

Anyway, I like it that you don't give up if something doesn't work out of the box.

Your "GPT-partitioned" disk ( disk 1 for WDe ). looks quite good. There are 5 partitions on it, 2 of them labeled "Basic data partition" - these are the interesting ones, your FAT32 partitions. Be aware that in the GPT each partition entry occupies 128 ( 80h ) bytes.

The next step that you have to learn now is how to navigate to your FAT32 partitions on the GPT-partitioned disk. It's pretty easy with WDe - you just have to position the cursor to the partition entry in the GPT and then press ENTER.

---
MS-DOS forever!

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