Who needs CDROM drives? Can I tell you that burning a DVD/CD is the devil’s work! I always prefer using a USB Flash or External USB drive.

To prepare a USB disk for Windows 7 you’ll need to make it bootable by using DISKPART.

  1. Format the drive by executing the following commands one by one . Make sure you replace Disk 1 with proper Disk number .
  2. select disk 1
  3. clean
  4. create partition primary
  5. select partition 1
  6. active
  7. format fs=NTFS QUICK
  8. assign
  9. exit
  10. Copy contents of Windows install media to USB device.

References