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I've just followed these instructions to make my USB HDD bootable, to install Server 2008 R2, but when I set my BIOS to boot from USB HDD, I get the error "NTLDR is missing". I did copy all the Server 2008 R2 files over from the ISO after mounting the ISO.

What could be wrong here?

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2 Answers 2

Reset to default
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NTLDR is Missing Press Ctrl+Alt+Del to reboot

I googled a while but I didn't get a straight and simple answer. Some one also had this issue and they were suggested to recreate the USB driver again, but this didn't fix the problem.

After a few research, I finally came up with a very simple solution:

  1. Boot the existing Windows (my one is XP, but Windows 7 should also work).
  2. Insert the created Windows 7/8 installer USB drive.

  3. Open a command window, go to the USB drive (my one is G:). Change directory to USBDRIVE:\boot (for example, cd G:\boot). This directory contains the executable file bootsect.exe. Under this directory, run the following command:

    bootsect /nt60 USBDRIVE:

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If NTLDR is Missing, press Ctrl+Alt+Del to reboot.
I got the same error message, but it was caused by different factors.

My BIOS setting was "legacy" and my USB driver was GPT.
After I updated the BIOS setting to UEFI, it fixed the error.

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