"Infinite Loop" of Problems

Leaving past fiasco behind, tried a USB 2 flash drive and an ISO download from Microsoft of Windows 7 Ultimate on my 2013 13" MacBook Air. On this latest attempt, have made it through the past "CD/DVD driver not found" issue and through creation of BOOTCAMP partition under Mac OS 10.13.6. Transition into the Windows installer causes a black screen with "Not a boot disk" error message. This is about the 3rd download from MS and various issues with all. Best case was with my Win 7 Ultimate installer DVD connected via an external DVD drive AND a USB 3.0 flash drive in the other USB port of the MBA simultaneously. That attempt went all the way through to this final error message: "Unable to create or locate a [usable] partition." I have tried too many approaches to list here, so let me just ask a few questions:


1. EXACTLY what needs to be put on the USB flash drive? The ISO image? Or the content of the ISO image, which is a file with a long alphanumeric string ending in "...DVD?" Or the content of THAT, which is a bunch of files? Can someone post a screenshot of the contents of a loaded flash drive that actually works?


2. EXACTLY where is the bundle of Apple-supplied Windows drivers to be put on the flash drive? (Apple says on the "root" level of the drive.) And are the 3 files Apple says to copy left as is on the drive, or do they have to be opened and their contents exposed at the root level?


3. There are several "setup.exe" files on the flash drive after the Apple bundle is copied to it. They are located in different folders. Should that arrangement be left alone or should they be somehow "prioritized?"


4. What is the correct "MD SHA" (I think that's what it is called) for the MS ISO download? My downloads have all been in the 3.32 GB region, although not all exactly the same. My Internet connection is either through a 5 GHz WI-FI (the MacBook Air) or, if I use my main computer, through a hardlined cable modem/NAT router. I don't necessarily get the same download ISO size for both link methods.


5. Does anyone have any idea why having the Win 7 install DVD directly hooked up to one USB port of the MBA, while the USB flash drive is hooked up to the other port, works "better" than using the USB flash drive by itself? (This happens whether the ISO image on the flash drive was sourced from the MS download or whether it was sourced from my Win 7 Install DVD.)


I would appreciate any answers or comments you might have, and thanks for reading!

MacBook Air, macOS High Sierra (10.13.6), Mid-2013 13" 128 GB SSD 4 GB RAM

Posted on Sep 6, 2018 10:44 AM

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59 replies

Sep 7, 2018 9:18 PM in response to Bill Strohm

Bill Strohm wrote:


... AND a USB 3.0 flash drive in the other USB port of the MBA simultaneously.

Do not use a USB3 flash drive, because the W7 installer has no USB3 drivers.

Bill Strohm wrote:



1. EXACTLY what needs to be put on the USB flash drive? The ISO image? Or the content of the ISO image, which is a file with a long alphanumeric string ending in "...DVD?" Or the content of THAT, which is a bunch of files? Can someone post a screenshot of the contents of a loaded flash drive that actually works?

It is the contents of the ISO, which go on the USB. The USB contents should look like this.


User uploaded file


Bill Strohm wrote:



2. EXACTLY where is the bundle of Apple-supplied Windows drivers to be put on the flash drive? (Apple says on the "root" level of the drive.) And are the 3 files Apple says to copy left as is on the drive, or do they have to be opened and their contents exposed at the root level?


See the image under the previous question.

Bill Strohm wrote:



3. There are several "setup.exe" files on the flash drive after the Apple bundle is copied to it. They are located in different folders. Should that arrangement be left alone or should they be somehow "prioritized?"

They should be left alone in the locations that they are in. Do not move them to other folders.


Bill Strohm wrote:



4. What is the correct "MD SHA" (I think that's what it is called) for the MS ISO download? My downloads have all been in the 3.32 GB region, although not all exactly the same. My Internet connection is either through a 5 GHz WI-FI (the MacBook Air) or, if I use my main computer, through a hardlined cable modem/NAT router. I don't necessarily get the same download ISO size for both link methods.


The MD5sum should not change. W7 ISO download from Microsoft web page requires the Product Key. I recommend using the wired computer to download the ISO.


Bill Strohm wrote:



5. Does anyone have any idea why having the Win 7 install DVD directly hooked up to one USB port of the MBA, while the USB flash drive is hooked up to the other port, works "better" than using the USB flash drive by itself? (This happens whether the ISO image on the flash drive was sourced from the MS download or whether it was sourced from my Win 7 Install DVD.)

'Better' is relative. Is there a specific behavior using one vs another? The USB flash drive should eb sufficient, if the USB2 contains the correct files. USB3 may be causing problems, because it will not allow the W7 installer to come up, if used by itself. If your W7 has 'multiple' W7 Products (Home, Professional, Ultimate, etc..) such a DVD will cause issues.

Sep 11, 2018 5:33 PM in response to Bill Strohm

OK, folks, I finally was able to install Windows 7 Ultimate on our Mid-2013 MacBook Air 13" computer. The procedure below, and ONLY this procedure worked for me after weeks of failed attempts.


1. Via an Ethernet hardline connection through our cable modem/NAT router to the Internet, and using my Hackintosh Mini-ITX computer, I downloaded a Windows 7 Ultimate ISO image from the Microsoft website, directly onto a 16 GB Kingston USB 2 flash drive. (Note: this specific method was the only one that worked to get a "good" ISO image for me.)


2. Plugged the flash drive into the MacBook Air's right-side USB port.


3. Downloaded the Apple "Bootcamp5.1.5640" Windows drivers and dragged the 3 files therein to the root level of the flash drive.


4. Very important: Copied the contents of the flash drive to the desktop of the MBA. (Trying to use its contents directly in Boot Camp as an installer didn't work.)


5. Ran Boot Camp starting with formatting the flash drive (ie. checking all 3 boxes). The flash drive is erased and then Boot Camp chooses the ISO image (on the desktop) and re-loads the ISO image onto the flash drive. (Now it will work!) Once this was done I ran just the 3rd checkbox in Boot Camp ("Install Windows.")


6. Pressed "Continue" as instructed by Boot Camp. Eventually, after partitioning 36 GB for Windows and 84 GB for the Mac, with my authorizations, the computer restarted on the Windows installer. Agreeing to the license then took me to the window "Which version of Windows 7 do you want to install?" I chose "Ultimate," and then chose the "BOOTCAMP" (disk 0s4 on my MBA) partition as the install target. Of course Windows told me it could not install there, so I clicked on "See details" where I was told that the format had to be NTFS (not MS-DOS FAT 32). Clicking "Drive Options" brought up icons one of which was "format," which I clicked for the BOOTCAMP partition. The installer re-formatted disk 0s4, but lost the "BOOTCAMP" name. Nevertheless, the rest of the Windows 7 install went smoothly.


7. When the "Boot Camp" app comes up in Windows, I followed the instructions to install the Apple files that Windows needs to run Apple stuff. Eventually the installation completed and now Windows runs on the MBA.

Oct 3, 2018 10:28 AM in response to Bill Strohm

Bill Strohm wrote:


"I suspect the Kingston's boot-ability." Not sure to which Kingston device you refer. The Kingston 480 GB NVMe SSD works fine on Mac OS 10.13.6, and the Kingston 16 GB "Traveler" USB 2 drive is the one that successfully ran the Windows 7 Ultimate installer ISO, back when I had the 128 GB OEM SSD in the MacBook Air, with the BootCamp partition set at 36 GB.

The USB2 Flash drive.


Bill Strohm wrote:



Is there any way to force a start of the Windows 7 Ultimate software independent of the Boot Camp Assistant process? All the files I allegedly need are on this flash drive, but picking that drive as the option at power on (or Restart) gives me only an active screen showing a very dark (but not black) background that goes away only if I shut down the computer with a long hold on the power button.

If you have the FAT partition manually created, connect the Kingston USB2, reboot and hold Alt/Option. Do you see any selections from the USB2 Flash drive?

Oct 3, 2018 10:43 AM in response to Loner T

"If you have the FAT partition manually created, connect the Kingston USB2, reboot and hold Alt/Option. Do you see any selections from the USB2 Flash drive?"


The FAT partition was created in Boot Camp Assistant, but for the rest of it, rebooting and holding Option (there is no Alt) shows the options "Windows" (I presume the USB2 drive) and "MBA SSD" (the internal 480 GB SSD). But I believe this Options window is all strictly Mac OS. Although Mac OS sees the USB2 drive as a boot choice, selecting it is what does what I described above. The Options window disappears, and the MBA restarts but gives only a very dark screen with no activity shown on the USB2 drive's LED. The computer is "on," the correct boot device is picked, but nothing happens.


Are you suggesting I should use Disk Utility to partition the drive like Boot Camp Assistant does, but without using Boot Camp Assistant? I can do that, but the problem seems centered on missing USB2 controller firmware, or something similar. Is there a USB2 controller on the flash drive (or in the Windows installer firmware)?

Sep 9, 2018 10:23 AM in response to Loner T

to LonerT:


Thanks much for the jpg of a working installer listing. In response, I also uploaded screenshots here. The first one is of the contents of a recently downloaded Microsoft ISO image. The second is of the contents of my original Win 7 Ultimate Install DVD. I find no significant difference between the two. From this I conclude that either should work as advertised, but neither does, in fact. However, there are significant differences between these matching installer listings and the screenshot you posted, leaving aside the addition of the Bootcamp driver bundle from Apple. The differences might be due to different installers for different versions of Win 7 (Home, Professional, Ultimate, etc.) or maybe not.


For clarity, I have also uploaded my installer listing after addition of the Apple driver bundle "#5." This would represent the current contents of my USB 2 flash drive. As far as I can tell, this is the version of the installer I have been using when attempting to install Win 7 Ultimate on my 2013 13" MacBook Air. I can only assume it will fail again.


Microsoft IOS Image Contents Downloaded Recently

User uploaded file


Original DVD:

User uploaded file


With Added Apple Contents of "BootCamp5.1.5640"

User uploaded file


Your screenshot:

User uploaded file

If you do a line item comparison you will see what look like significant differences (to me). For one, you show the efi/boot and efi/Microsoft folder at the same level indenture. On my installer(s), the boot folder is inside the efi/Microsoft folder. Also, your screenshot shows a "memtest.exe" file of 1.2 MB, whereas mine shows "memtest.exe" of 486 KB, and a "memtest.efi" file of 611 KB. And of course all the dates are different. Sizes are different too; my "setup.exe" is 107 KB, yours is 77 KB.


I could try another installation, but I would prefer to hear from you first.

Thanks for your previous attention and help!

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"Infinite Loop" of Problems

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