Make a USB drive bootable

Warning this WILL DELETE ALL DATA on the drive

Format Your USB Key

1.  Run cmd.exe as administrator
2.  Type diskpart
3.  Type list disk
4.  Type Select Disk #
5.  Type Clean
6.  Type Create Partition Primary
7.  Type Select Partition 1
8.  Type Active
9.  Type Format FS=Fat32  to format the drive Fat32 or type Format FS=NTFS for NTFS
10. Type Assign
11. Type Exit

Next just copy what ever software on the drive that you want to boot to.  I use the above to format a usb drive before I copy the install files for Windows 7 or Windows 8.  This comes in handy when you need to load windows on a laptop that does not have a CD Rom drive.