Making a ChromeOS partition bootable on a Windows Laptop

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I have a Lenovo Yoga 3 Pro I want to use ChromeOS on, in addition to Windows 10. UEFI is enabled in the BIOS.
I have successfully installed ChromeOS (CloudReady) and then used it once. But I can't boot to it to get back to it. It seems the process didn't make the disk bootable.
In Windows Disk Manager the Partition is set as a Primary Partition but isn't set as a Boot disk. And there is no option to.
In the command line diskpart I cannot make it Active. I get the error:
The selected is not a fixed MBR disk. The ACTIVE command can only be used on fixed MBR disks.
When I select the inbuilt Lenovo boot manager I get a choice of the SATA HDD or Windows Boot Manager. Both arrive at the same place - Windows.
How do I make the partition bootable?

down votefavorite

I have a Lenovo Yoga 3 Pro I want to use ChromeOS on, in addition to Windows 10. UEFI is enabled in the BIOS.
I have successfully installed ChromeOS (CloudReady) and then used it once. But I can't boot to it to get back to it. It seems the process didn't make the disk bootable.
In Windows Disk Manager the Partition is set as a Primary Partition but isn't set as a Boot disk. And there is no option to.
In the command line diskpart I cannot make it Active. I get the error:
The selected is not a fixed MBR disk. The ACTIVE command can only be used on fixed MBR disks.
When I select the inbuilt Lenovo boot manager I get a choice of the SATA HDD or Windows Boot Manager. Both arrive at the same place - Windows.
How do I make the partition bootable?

It needs to be added to the UEFI boot menu but do you have secure boot enabled as that could stop it booting

Thanks - but how do I add it to the UEFI boot menu?
(And when I disable UEFI the partition still doesn't appear in any lists to boot from).

deepskydiver said:

Thanks - but how do I add it to the UEFI boot menu?
(And when I disable UEFI the partition still doesn't appear in any lists to boot from).

Thanks for asking this question. Been trying to do that for 2 weeks now after update to version V68.4. My goal is to get Linux mint and CloudReady on same disk. Both work independently now.

This may be the simple way if your not sure How to edit UEFI boot menu entries in Windows using EasyUEFI software - YouTube

When using that tool the partition I want to boot from is not available for selection.

Just to close this off - the installation to that partition hadn't completed, which was why it wasn't possible to make it bootable.