Creating Bootable USB Flash Drive.

The USB Flash Drive must be configured with an active primary MS-DOS partition. It must also contain the boot files. Follow the steps below to create a bootable USB Flash Drive.
Requirements:

• Motherboard with BIOS that supports USB boot.
• USB Flash Drive that may be erased.
• Bootable floppy disk or CD with Fdisk and Format commands.

1. Plug in the USB Flash Drive.
2. Make the USB drive the only bootable hard drive. Method 1:
   If available, change the BIOS settings for the hard drive sequence, making sure the USB device is at the top of the list above all other hard drives. Not all BIOS Setup Utilities have this option. Method 2:
   Disable all hard drives in the BIOS. In some BIOS Setup Utilities you can disable the individual hard drives, while in others you will need to disable the controller. Method 3:
   Unplug all hard drive cables inside the case. If the cables are unplugged the computer cannot detect and boot to the hard drive.
3. Insert the bootable floppy disk or CD into the appropriate drive.
4. Restart the computer to the bootable floppy disk or CD.
5. At the command prompt, type: FDisk.
6. Delete and create a new active primary DOS partition.
7. Use FDisk to delete all partitions from the USB Flash Drive.
   • In FDisk, press the 3 key to Delete partition or Logical DOS Drive.
   • If there is just one partition on the drive, choose 1 to delete the primary DOS partition. If there are several partitions, the extended and logical partitions must be deleted before the primary partition.
   • After choosing option 1, the screen appears with partition information and a prompt for the partition to delete. Choose which primary DOS partition to delete, and then press ENTER.
   • A prompt appears to enter the volume label of the hard drive. Enter the label exactly as it appears on the top of the screen in the partition information. If the volume label contains gibberish or lowercase letters, the partition will have to be deleted as a non-DOS partition. Try using the option to delete a non-DOS partition in FDISK. After entering the volume label, press ENTER.
   • You are prompted if it should delete the partition. Press Y for Yes, and then press ENTER.
   • The screen changes to show only the total disk space and a line near the bottom that prompts that the primary DOS partition has been deleted. Press the ESC key to return to the main menu.
8. Use FDisk to create a primary partition on the USB Flash Drive. The drive letter will be C:, since all other hard drives were disabled in step 2.
   • In FDisk, press 1 to Create DOS partition or Logical DOS drive.
   • Press 1 to Create a Primary DOS Partition.
   • The next screen prompts if the maximum hard disk size should be made into one partition. Press the Y key, and then press ENTER.
   • The next screen prompts that the computer will now reboot. Press ENTER to continue.
9. Exit FDisk and restart the computer.
10. Start the computer from the bootable floppy disk or CD with the USB Flash Drive still connected.
11. At the command prompt, run Format by typing the following command: Format c: /s. Press ENTER.
12. At the command prompt, run FDisk by typing following command: Fdisk /mbr. Press ENTER.
13. Restart the computer without the bootable floppy disk or CD, and attempt to boot to the USB Flash Drive. If it works, it should go to a C:\> command prompt.
14. Change the settings made in step 2 back so that the computer operates normally again.