would it be possible to patch the bios to support 5 1/4" floppy drives? Unlikely. Most systems past the Pentium III / Athlon XP era don't support 5.25" floppy drives, regardless. By that point, 5.25" floppy drives were not in common use, with 3.5" floppies eventually following a few years later. Also if I have to use an adapter of some sort I can. I don't have access to any older computer that would work. There is an adapter called the FC5025 USB 5.25" Floppy Controller that will allow you to connect the drive externally through the USB. The downside is that the controller is basically for retrieving data, and will not write to disks. As far as I'm aware, no commercial 5.25" external USB floppy drive unit has ever been made. Your best bet is to purchase a used late 90s system that's capable of running Windows 95, Windows 98, Windows 98 Second Edition or Windows Me. Other than that, there really isn't a solution that will work with modern day systems.
I am trying to install a 5 1/4 in. floppy drive, specifically the TEAC FD-54B-02-U, inside of a dell dimension 3000 via the floppy interface. The bios recognizes that it's there but thinks its a 3 1/2 in. drive. I tried to change the settings on it, but there isn't a 5 1/4 in. drive option. I need to get it working so i can copy files to and from a Tandy 1000. is there a fix for this?  also, both computers have the same model of drive.
5 1/4 in floppy drive dell dimension 3000 help