Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Level 1

8 points

Failed Win 10 install on Bootcamp High Sierra

I have iMac 27" late 2013 with 3 tb fusion drive with High Sierra installed on a single Mac OS partition.

I am trying unsuccessfully to install Windows 10 on a Bootcamp partition (ca 600GB).

Everything is going well until the Windows installer goes into "Finalizing" section when I constantly get an error saying "Windows could not prepare the computer to boot into the next phase". I have tried few times to install with different partition size, resetting NVRAM, reinstalling High Sierra on clean disk. I am able to delete this partition and try another install to no avail.

Any suggestions please? If anyone had the same problem and solved it I would appreciate your help.

Piotrek

iMac

Posted on Nov 13, 2017 9:49 AM

20 replies

Loner T

Level 9

59,471 points

Nov 14, 2017 4:54 AM in response to Piotrek L.

Can you post the output of

diskutil list

It will show the ordinal position of the disk slices.

Piotrek L. Author

Level 1

8 points

Nov 14, 2017 6:21 AM in response to Loner T

What should I do then?

Loner T

Level 9

59,471 points

Nov 14, 2017 6:32 AM in response to Piotrek L.

Are you using a USB Installer? If yes, boot from it using Alt/Option and check if you have two icons, Windows and EFI Boot. Test with EFI Boot.

Loner T

Level 9

59,471 points

Nov 14, 2017 10:40 AM in response to Piotrek L.

Do you have any external storage, other than the USB Installer connected? If yes, disconnect them, run a SMC/NVRAM Reset and try again. Do not use a USB HDD as the installer.

Piotrek L. Author

Level 1

8 points

Nov 14, 2017 10:44 AM in response to Loner T

No other USB storage connected. I am using 32gb flash as an installer. Tried this approach it already. Resetted NVRAM with single partition and tried new install.

Failed Win 10 install on Bootcamp High Sierra