SOLVED Couldn’t install Windows 10 Technical Preview

March 19, 2015

Well today is two blog posts in a row šŸ˜€ Both covering Windows 10.

After my first issue I ran into another that had me stunned for a while.

WTF

“Couldn’t install Windows 10 Technical Preview.  Windows can’t be installed because this PC has an unsupported disk layout for UEFI firmware.  Please reboot and change the PC’s firmware to BIOS to allow Windows to setup to continue.”

I then looked into the log C:\$Windows.~BT\Sources\Panther\setupact.log

There I found the cause to this error:

CONX ConX::Compatibility::CSystemAbstraction::HostIsUEFIDiskLayout: Boot disk has ESP partition.
CONX ConX::Compatibility::CSystemAbstraction::HostIsUEFIDiskLayout: Boot disk does not have MSR partition.
ConX::Compatibility::CSystemAbstraction::HostIsUEFIDiskLayout: Boot disk does not have UEFI disk layout.

I didn’t seem to have a MSR partition. https://technet.microsoft.com/en-us/library/dd799232%28v=ws.10%29.aspx#MicrosoftRecoveryPartitions

A quick look using diskpart confirmed this. So i opened up some space on the disk using Disk Management and created the partition.

image

That sorted the issue and Iā€™m writing this blog post from Build 10041

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