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MP 1,1-5,1 Installing Windows 10 in Legacy/BIOS mode in cMP with Boot Camp Assistant

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
Sergey-Galan said:
The image may not be original and does not match the path - /V*/*/sources/install.*
Although there would be formatting, but your formatting is also missing.
Click to expand...
The same image works fine for hybrid MBR. Also tried the Windows 7 image with the same result. That one also works fine for hybrid MBR.
Code: 
Could not open /dev/disk12s1: Resource busy
Windows Install disk12s1 Applying image 4 ("Windows 7 ULTIMATE") from "/Volumes/GSP1RMCULXFRER_EN_DVD/sources/install.wim" to NTFS volume "/dev/disk12s1"
Volume BOOTCAMPMBR on disk12s1 mounted
hivexsh: failed to open hive file: /Volumes/BOOTCAMPMBR/Windows/System32/config/SYSTEM: m

It is failing to apply the image to the MBR partition.
1717856526275.png
 

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  • Windows Install-Output.txt
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I noticed that even if I mount the image and drag/drop the Install.wim it immediately unmounts the iso and the Wim file of course disappears.
 
Sergey-Galan said:
Try changing the name. The mkntfs utility worked, but now Wimlib does not want to work.
Click to expand...
Doesn't help. The drive is seen as an external USB disk and I see a lot of unmounts/remounts.
 

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  • Windows Install-Output.txt
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Sergey-Galan said:
Again formatting did not happen. I'm sure it's a disk problem. Above in my attachment you can see that the installation was successful.
Click to expand...
It looks like there is a problem with the external drives. I mounted the SSD as an internal drive below the DVD-ROM and it worked fine.
 

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  • Windows Install-Output.txt
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startergo said:
It looks like there is a problem with the external drives. I mounted the SSD as an internal drive below the DVD-ROM and it worked fine.
Click to expand...
I install Windows using a program only on an external USB drive, and the first launch of the system with a hybrid partition, or MBR, I do on a SATA connection on my daughter's computer.
startergo said:
I noticed that even if I mount the image and drag/drop the Install.wim it immediately unmounts the iso and the Wim file of course disappears.
Click to expand...
Fixed. Updated the program.
 
startergo said:
It looks like there is a problem with the external drives. I mounted the SSD as an internal drive below the DVD-ROM and it worked fine.
Click to expand...
I found a very old HDD disk and three times in a row what happened to you happened, on the fourth time the installation started. I don't think there will be such problems with SATA.tempImage4aDFbO.png
 
See if this log makes any sense.
 

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  • Windows Install-Output.txt
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startergo said:
Yes I saw that. But why? There is no lock there?
Click to expand...
Off topic, but when I install Windows onto an external drive using a VM and whole disk mode I notice I have to explicitly unmount the disk for any disk manipulation on the drive as it will try to be remounted (even if it does not reappear on the desktop). This may only apply to VirtualBox, but I wonder if something similar could be happening here?
 
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So, if you explicitly unmount, but it keeps remounting there is no cure. How did you go around that? Or are you saying that it unmounts/remounts automatically?
 
@tomsmods @Sergey-Galan
I have attached the external drive to my MacBookPro15,1 running Sonoma.
Disabled indexing sudo mdutil -i off /
Unmounted manually the partition and Installed Window 7 in MBR mode.
Enabled indexing sudo mdutil -i on /
 

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  • Windows Install-Output.txt
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Unfortunately the above procedure does not work for Windows 10 ISO. Go figure.
I can install Windows 10 in UEFI mode, but not in MBR nor in Hybrid on the external disk.
 
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