[syslinux] Memdisk and big floppy images

R S rene.shuster at bcsemail.org
Mon Jun 18 11:03:27 PDT 2018

Haven't yet had a need for 10MB FDD images. The biggest I had to create was
5MB (5760kb). At that time I had to use WinImage to create the FDD image
and it took me a while to figure out the correct settings.

My notes state:

"I'm getting 'missing FAT' errors in WinImage, and 7-zip complains about
'unexpected end'. The fix is to increasing the FDD Heads from 2 to 4 and
keeping Sectors at 36 in WinImage settings.
Here are the settings I used:
Bytes per sector: 512 (0x200)
Sector per Cluster: 4 (2048)
Total number of Sectors: 11520 (0x2d00)
Number of FATs: 2
FAT12/16 Root Entries: 240 (240 files can exist in root before a
subdirectory has to be created)
Media Descriptor: 240
Sector per FAT: 9
Sector per Track: 36
Heads: 4
Reserved sectors: 1
Hidden Sectors: 0
Physical Drive Number: 0"

WinImage is a Windows program. I could never figure out an equivalent to
WinImage for GNU/Linux.

On Mon, Jun 18, 2018 at 1:04 PM, Paul Menzel via Syslinux <
syslinux at zytor.com> wrote:

> Dear Syslinux folks,
> For a firmware update I am following the Gentoo Wiki [1] to create a floppy
> image of 20 MB, so that the vendor update utility fits.
> Unfortunately, FreeDOS does not load, and it seems to hang loading the
> FreeDOS kernel. The original FreeDOS image boots. Do you know if that issue
> is memdisk related? It’s started from GRUB with the commands below.
>     linux16 /boot/memdisk floppy
>     initrd16 /boot/freedos.img
>     boot
> Kind regards,
> Paul
> [1]: https://wiki.gentoo.org/wiki/BIOS_Update#Create_a_custom_
> FreeDOS_image
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