I have a trusty WinSetupFromUSB flashdrive with XP, Vista and 7 on it that I've used multiple times to reinstall my retro PC with a 990FX Sabertooth board. However, I recently decided to rebuild my rig with a 990FXA-UD5 board instead and now attempting to boot into either of the 3 OSs results in a

1It seems your USB disk was seen as a Floppy/ZIP disk by BIOS
2[...]

warning. It then tries to launch the PLoP boot manager, which fails. I can boot into PLoP myself after a restart by pressing F2, but that doesn't help either as when it tries to detect the USB drive it either freezes or says no device detected.

On the Gigabyte board, I have legacy USB function enabled, USB storage enabled and it's set to boot from USB-HDD only. The USB drive is plugged into a rear USB 2.0 port, though I tried USB 3.0 for good measure to get the same result. All irrelevant USB devices are disconnected.

After some faffing about with ChatGPT and the grub command line, I figured out that the USB drive was detected as fd0 (that's a zero, the font here makes it look like the letter 'o') when it was supposed to be something like e.g. hd0. ChatGPT recommended I try removing

1/shifthd.bat

from the list of boot commands, which failed. I then took it upon myself to try other things like replacing

1root (hd%RDSK%,0)

with

1root (fd0,0)

and while some of the things I tried allowed the boot sequence to progress further, it still ultimately failed. I don't really know what I'm doing so I might've been doing something silly.

I'm wondering if anyone has any idea as to how to

• either make the flashdrive identify as what WinSetupFromUSB expects
• or tweak the commands in a way that allows it to work regardless

Thanks!