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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] tools/atari-hd-image.sh
- From: Uwe Seimet <Uwe.Seimet@xxxxxxxxx>
- Date: Wed, 13 Mar 2024 21:58:27 +0100
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Hi Christian,
these data may be relevant for so-called super floppy media, which only have
a single partition and use the root sector as their boot sector. I don't
know about Windows, but at least some DOS versions supported this format.
It also has a certain relevance for the Atari, in particular when formatting
a floppy disk in a SCSI floppy disk drive or an LS-120 drive. In this case
you need the boot sector data in the "root sector" of the floppy disk.
By the way, with HDDRUTIL you can create such a format by not entering
any partition data when partitioning. HDDRUTIL will then ask you whether you
want to partition the medium like a floppy disk.
Best regards
Uwe
> Hi,
>
> I recently participated in a discussion on AF regarding the
> atari-hd-image.sh script:
> https://www.atari-forum.com/viewtopic.php?p=460130#p460130
>
> ... and I wanted to see if I can propose a patch to make it better.
> (After the Hatari 2.5 release, of course.) But I don't fully understand
> what I see inside the existing script in the first place.
>
> For example: Why is the *MBR* (aka: root sector) filled with data such
> as the sectors per cluster or the media descriptor 0xF8?
> https://git.tuxfamily.org/hatari/hatari.git/tree/tools/atari-hd-image.sh?id=891f190e20c8358494b4a8685b749ae2ad6eb22d#n190
>
> Looking at the offsets, this appear to be fields that are meant to be
> inside the BPB in the VBR (aka boot sector of the partition):
> https://en.wikipedia.org/wiki/BIOS_parameter_block.
>
> So, what is the use-case of putting those in the MBR? Which
> software/driver expects this information to be in this (wrong) place?
>
> Regards
> Christian
> --
> Christian Zietz - CHZ-Soft - czietz@xxxxxxx
> WWW: https://www.chzsoft.de/
> New GnuPG-Key-ID: 0x8708B34C827B159E
>
>