How to Copy a Bootable CD/DVD to USB
Open the "Start" menu.
In the search box, type "diskpart" and press the "Enter" key.
This command runs the DiskPart utility.
Make sure the USB key or flash drive is plugged in before proceeding to Step 2.
Note: Commands should be entered without quotation marks.
Type "list disk" and press "Enter."
Make a note of the disk number of the USB drive.
For example, if your computer has a single hard drive,
the USB flash drive will be Disk 1.
If your computer has more than one internal drive,
look at the size of the drives to find the USB flash drive;
it should be significantly smaller.
Type "select disk X" and press "Enter."
Replace "X" with the disk number of your USB drive.
If you drive is Disk 2, type "select disk 2."
This command tells DiskPart what drive to use.
Type "clean" and press "Enter."
The "clean" command removes existing formatting and data from the USB flash drive.
Type "create partition primary" and press "Enter."
This command tells DiskPart to create a single primary partition
that takes up all the space on the drive.
Type "select partition 1" and press "Enter"
to select the partition that was just created.
Type "active" and press "Enter" to mark the newly created partition
as an active system disk.
Type "format fs=fat32 quick" and press "Enter."
This command formats the USB drive using the FAT32 file system.
Type "assign" and press "Enter."
This assigns a drive letter to the newly created partition,
making it possible to access from Windows Explorer.
Insert the bootable CD or DVD that you want to copy.
Open the "Start" menu and click the "Computer" icon.
Windows XP users should click the "My Computer" icon.
Right click the CD/DVD drive containing the bootable CD and click "Explore."
Press the "Ctrl" and "A" keys simultaneously.
Drag the files in the CD to the flash drive letter
on the left side of the window to copy them.
The USB drive should now be bootable.