How to make a ghost bootable usb. Use the bootsect utility in Norton Ghost to make the USB flash drive bootable. In the same command prompt that was used in Step 1, type in the following commands, replacing the drive letter 'g' with the correct letter of your flash drive. When finished, close the command prompt. A good solution also, if the build is not too large is to make a bootable ghost cd, save track in nero, open it in the iso tool of your choice, and add.