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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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Here is a tutorial using the Windows 7 USB/DVD Tool. Try using that tool. I have had problems before with mounting and copying an ISO but this program helped.

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I tried that, but my laptop doesn't boot from the DVD that tool creates. The tool doesn't recognise my USB hard drive, just my USB flash drive, which is too small. – ProfKaos Jan 26 '10 at 16:15
Okay, I miss read the question, but to be honest USB HDD are generally disk based which is the problem. you need a flash drive. – Doztech Jan 26 '10 at 18:03
the problem isn't that USB HDD are disk based, but that instructions that should apply to both types of USB (I mean, DISKPART is an HD tool) are not working. – ProfKaos Feb 13 '10 at 8:10
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