Create A Bootable Thumb Drive With DiskPart

Insert your USB Thumbdrive into your Windows 7 computer. (Note that you may not be able to do this with a Windows XP computer.s)

Start a command prompt by going to Start button / All Programs / Accessories / Command Prompt

Or, Start, Run, type in cmd

Then, at the command prompt, type:

diskpart

list disk

- This lists the disks available in your system. Check whether the Thumb Drive disk to make bootable has the proper size and corresponds with that of your USB Thumb drive

.
select disk 2 (2 has only MB and not GB)

- This selects the disk number of your USB key. Change accordingly to reflect your USB thumb drive if you have multiple drives on your Windows 7 system.

clean

- This will delete everything on your USB Thumb Drive, so before you do this, make sure you are doing this to your USB key and not your hard drive! This is dangerous.

create partition primary

- This creates a primary partition in your USB key

select partiion 1

- This selects the newly created partition

active

- This makes the partition active

format fs=fat32

-This formats the selected partition with FAT32 filesystem. (We have had some thumbdrives that still were not bootable with a fat32 file system.
In that case we jused "format fs=ntfs" and that worked for us. So this is an option.)

assign
- This assigns the USB key to a drive letter

exit

At this point, your USB key will be empty and formatted with the FAT32 or NTFS filesystem. Now, if you have a Bootable CD such as Norton Ghost, or whatever, you should be able to copy the files and folders over to the USB key and it should be bootable.