Go to the web site https://dosprograms.info.tt/indexall.htm, go to the Utilities section then scroll down to and click "USB DOS drivers." Is this helpful?

USBDRIVE does detect and assign a letter to my USB flash drive, however, it isn't assigning my USB floppy drive a letter.

USBDEVIC does list it as a UFI FLoppy CBI from vend TEAC (I can list all the specifics if it's needed) - I will say that under interfaces it says "Owned" and the root hub and SCSI storage says "Y" for owned, but not the floppy. So I’m guessing what that means is that it’s detected as a device but there’s no driver that can read it?

I do have a driver disk but that's just for windows 98, I think.

USBDRIVE says that it is for SCSI compatible devices, and the floppy drive is UFI

Try it this way. instead. You can ignore some of the stuff hes saying if youre using dos 7.10 with fat32 support.

http://www.dosdays.co.uk/topics/usb_support.php

It detects there's a floppy FDD there, but it's erroring out.

Kitty Trouble wrote on 2023-08-08, 03:03:

SCSI compatible devices, and the floppy drive is UFI

UFI should be an extension to standard SCSI-based USB MSC that adds the (absymally minimal) features to give some compatibility for a strictly CHS-only format, available in various geometries, that needs low-level formatting on a famously LBA-only standard 😀

Generally USB floppy drive support is left to the firmware as part of the "USB legacy support" (apparently more common than PS/2 keyboard and mouse emulation with which is usually conflated!)