Sometimes having a bootable DOS USB disk/drive will become handy to run legacy applications, Operating Systems and few updates which need the computer to be booted from USB or floppy disk. Unfortunately Windows 8,7 and 8.1 OS will not allow to create bootable USB drive while formatting, they support only floppy disks in this method. Here is the simple guide about how to create bootable DOS USB disk in Windows 8 or 8.1 by using third party application.
Since we do not get the option to make MS-DOS bootable USB disk in Windows 8 or 8.1, we will be using third party tool called ‘Rufus’. It can create a DOS bootable USB disk, then you need to copy the other required files for the real purpose, like BIOS update files.
Here is an example of Windows OS which doesn’t allow to create DOS bootable disk and it is (‘Create an MS-DOS startup disk’) disabled for USB disk.
Create Bootable USB Disk in Windows 8 or 8.1 by Rufus
1) Download Rufus from official site here, it’s a free and small tool. Installation not required, just download and run it when the USB is connected.
2) It automatically detects the connected USB disk. As you must be knowing all existing data in the USB will be erased.
Rufus comes with FreeDOS OS, so you do not need to download any DOS OS here. Therefore, to create a simple bootable DOS USB disk in Windows 8 or 8.1, make sure to select ‘FreeDOS’.
3) If you like to create MS-DOS bootable disk, select the MS-DOS version, but you need to have MS-DOS ISO file for that. MS-DOS ISO can be downloaded here (Win98_bootdisk.iso). Once you have downloaded the Win98_bootdisk.iso file, browse the ISO while formatting USB disk as shown below.
Once the disk is formatted, it can be bootable in FreeDOS OS. Now you can copy the other files (BIOS update or other DOS based programs) to USB disk by Windows explorer and start using.