ShreddyMcgee

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Apr 10, 2013
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I'm attempting to boot a copy of Windows 7 from a legal and legitimate ISO file that is stored on a USB drive. I have a serial number and product key, etc but I am still running into the NTLDR missing error. I've tried several different boots including FAT32 which does not work at all and NTFS which is usually where I receive my NTLDR message and using UNetbootin which basically prepares your USB drive to become bootable. With the last option I either get a UNetbootin infinite loop or continue to get the NTLDR error. Another issue I have is that my hard drive died so I didn't get a chance to make a back up and I only have access to a Mac and a Windows XP machine with no internet. This is making it virtually impossible to create a bootable USB disk (using Windows USB/DVD tool) because neither of the other machines at my disposal can run that program. I can not burn a DVD with either of these extra computers as well, so that limits my ability too.
 

Solution
Making a flash drive for Windows 7 requires the following steps. Do you have something that can accomplish them?

Clean the drive to remove configuration data, and diskpart is normally used for this.

Create a partition and format using Fat32, then make it active, assign a drive letter and copy over the files from an Install DVD, or a mounted .iso file.

If you want to use UEFI, you will also need to create a folder in the EFI folder and add a file called bootx64.efi which is a renamed bootmgwf.efi file. So you have EFI\boot\bootx64.efi and that file is on all x64 Windows 7 installs in the Windows\Boot\efi folder or you can use 7 Zip to pull it from the .iso file.

The Microsoft .iso to flash drive utility...
I'm not a Mac user but there's an article here on burning an iso file to dvd from a Mac - any use?

How to Burn ISO Files to a DVD on a Mac | eHow.com
 

Nope, this Mac cannot burn DVDs. Trust me I would have already been to Target or Office Max today if that option would work. Unfortunately, the only computer that has the ability to burn DVD's is the one with a dead hard drive.
 

MS had a tool to burn a Windows 7 ISO to USB. Check at MS I don't know if it would work on a Mac.
Joe
 

Making a flash drive for Windows 7 requires the following steps. Do you have something that can accomplish them?

Clean the drive to remove configuration data, and diskpart is normally used for this.

Create a partition and format using Fat32, then make it active, assign a drive letter and copy over the files from an Install DVD, or a mounted .iso file.

If you want to use UEFI, you will also need to create a folder in the EFI folder and add a file called bootx64.efi which is a renamed bootmgwf.efi file. So you have EFI\boot\bootx64.efi and that file is on all x64 Windows 7 installs in the Windows\Boot\efi folder or you can use 7 Zip to pull it from the .iso file.

The Microsoft .iso to flash drive utility will make a bootable flash drive as long as you do not need UEFI. But the Microsoft utility will not work from a UEFI install because it cannot run bootsect.exe, which defines the boot loader, NTLDR or Bootmgr.
 

Solution
Apparently in OSX you can do it using the disk utility. How to "burn" an ISO to USB flash drive? - MacRumors Forums
 

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