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You need some sort of boot media to load DOS. In addition to floppy drives, you can also use a CD-ROM, USB Flash drive, or boot over a network.
It is possible to boot MS-DOS or Linux from a USB Flash drive, but not all computers support doing it.
Put your question in google and you will find many utilities for your purpose.
USB boot allows you to boot your system from virtually any USB device. You basically can but from floppy, CD/DVD, and stick as far as they have USB interface.
In Windows, press F8 during booting.. You will find a menu in which you will fine an option - "Safe Mode in DOS Prompt".. Enter in that menu, you will boot from DOS Prompt.. In Windows 98, you will find the "Boot from DOS prompt".. You can select that option to boot from DOS..
DOS is itself an OS.. It use the boot files to boot.. Few of them are: Config.Sys MSDOS.SYS Command.Com
If you have a USB drive and your BIOS supports booting from a USB device then try that.
AS DOS boot sequence is the series of steps your computer takes when it is turned on. Once the DOS boot sequence has been completed, the start up activities then go into action.
I'm not sure if its a soft boot but Ctrl+Alt+Del will reboot the machine when using DOS. It probably is a soft boot.
With a usb connected enter your system BIOS by pressing the Delete key during boot up through one of the menus select primary boot as usb. Where the selection is located in the menu will vary depending on your system.
You cannot move the BIOS into a USB device. I think you meant the boot order/setup. To do so, enter your BIOS settings page when you switch on your computer (you have to press ESC or F8 or some other key depending on your motherboard). Then search for some option labelled something like Boot setup or boot order. There change the preference from your current boot disc (where your OS is) to the desired USB device. Note that your USB device should have a boot loader to correctly boot the OS stored on it.
This was a BIOS settings issue. In the BIOS of this Asus netbook I found a second setting, which also had to be set with "USB" as 1st boot device. When I found this setting, the 'Boot Settings' dialog box had the following categories: "Boot Device Priority". "Hard Disk Drives": It was necessary to additionally set "USB" as 1st boot device within the "Hard Disk Drives" category. In here its default settings were: "HDD" "USB".