- Insert a USB key in the system.
- Open a command prompt.
- Use diskpart.exe to format the USB key as a single FAT32 partition spanning the entire key, and set the partition to active, as shown in this example.
list disk(note what disk the USB drive is. In this example it is Disk 2…I)
select disk 2
create partition primary
select partition 1
format fs=fat32 quick
- Copy files from ISO to the USB key.
For NTFS bootable USB drives there are some additional steps.
- Follow the steps above, but when formatting use
format fs=ntfs quick.
- Remount the USB key if diskpart ejects it.
- Insert a Windows Operating System installer ISO image.
- Open a command prompt as Administrator and navigate to the boot folder (mine ISO is mounted in J:)
bootsect /nt60 G:(where G: is the drive letter of your USB key). You should see something like this:
J:\boot>bootsect.exe /nt60 G:
Target volumes will be updated with BOOTMGR compatible bootcode.
Successfully updated NTFS filesystem bootcode.
Bootcode was successfully updated on all targeted volumes.