OK, this is more note to myself, but I think you might find it useful as well. I was trying to install Windows 7 on my laptop which does not have DVD drive so I had to do it from flash drive.

You need 4 Gig flash drive for this, which is what I’ve used.

Here are step by step instructions:

  1. Insert USB Flash Drive
  2. Insert Windows install DVD
  3. Run Command prompt
  4. Type:
    diskpart

  5. Type:
    list disk

  6. Note the disk number of your USB Flash Drive from the list that comes out. In my case it was disk 2
  7. Type:
    select disk 2

    (note that you need to replace disk 2 with the number of your flash disk)

  8. Run following commands (please make sure you have selected right disk since this will format it):
    clean
    create partition primary
    select partition 1
    active
    format fs=fat32
    assign
    exit
  9. Now copy content of your Windows DVD disk to Flash Drive. Type:
    xcopy e:*.* /s/e/f g:

    (note that you must replace e: with the drive letter of your DVD drive and g: with drive letter of your USB Flash Drive)

  10. That’s it. You can now use your USB Flash Drive to install Windows on new machine.

Hope this helps.

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