Boot Camp error “Windows cannot locate the disk and partition specified in the unattended answer's file”

I have a 2019 MacBook Pro 16 inch running on macOS Big Sur 11.1. I am trying to install windows using Bootcamp. I get the following error:

Windows cannot locate the disk and partition specified in the unattended answer file's < ImageInstall > setting. Make sure the setting references a valid partition and restart the installation.

Attached the image of my disk utility without Bootcamp partition and the Image of the error.

Can someone help me how to solve this?

Thanks in advance 

MacBook Pro 16″, macOS 11.1

Posted on Jan 24, 2021 7:56 PM

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Posted on Jan 25, 2021 6:19 AM

BC Assistant is failing to create the correct Windows Installer partition (OSXRESERVED).


  • Can you run a SMC and NVRAM Reset and try?
  • If that does not work, can you create a Time Machine backup of macOS?

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31 replies

Jan 26, 2021 10:31 AM in response to dhruva1108

  • If you do not have data that you want to preserve, you can boot into Internet Recovery and wipe the whole internal disk and install macOS Catalina.
  • If you want to preserve data, create a Time Machine backup, install Catalina as noted, install Windows, and then restore your files from the backup. If you restore the full backup, you will wipe you Windows installation.

Jan 28, 2021 6:32 AM in response to dhruva1108

dhruva1108 wrote:

I downgraded to Catalina and Bootcamp was successful...

Excellent!

I am not able to see any content in the time machine backup... i had taken a copy and verified

If you created a TM backup, when you connect the TM disk to the macOS side, and open the TM disk in Finder, you should see files and folders. Are there any files?

Feb 3, 2021 5:45 PM in response to Loner T

never mind... I found a solution

cd /Volumes/[Backup Disk Name]

then went into the backup folder [Macintosh HD - Data] and used -

cp -r [source folder name] ~/

this solved my case... though it did not reflect in Finder... it reflected in the terminal and I could copy it like this

and downloaded the apps again


Thanks a lot, @Loner T sir... for your help through the whole process

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Boot Camp error “Windows cannot locate the disk and partition specified in the unattended answer's file”

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