Gigabyte won't boot from SSD alone but will in dual boot

Jan 10, 2019
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Gigabyte GA-H110M-S2H with Toshiba 500gb HDD and Samsung 860 Evo 500gb SSD, BIOS version F25.

Did a fresh install of Windows 10 Home on the SSD because I couldn't clone it from the HDD (different sector sizes). Used MS Media Creation Tool to do that. With both drives connected and BIOS settings of "Other OS" in Windows 8/10 Features and Legacy enabled in Storage Boot Options Control, the thing goes ok to a screen asking me which Windows installation to boot from and then continues to boot correctly according to which ever of the two drives I select. I've done that multiple times as I installed programs on the SSD, installed the 1809 update + copied data over etc from the HDD.

But if I remove the HDD, the system complains that there is no bootable device. I've searched all over and am getting nowhere resolving this, even after changing some of the BIOS settings so that it doesn't use "Other OS". Any ideas? The SSD is definitely still connected.
 
Solution
Did you have the toshiba drive still connected while installing windows fresh to the ssd??

If so the primary boot partition has likely ended up on the toshiba instead of the ssd.

A full reformat/reinstall with only the ssd connected should solve this.
Jan 10, 2019
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Update:

Windows 10 Disk Management, when dual-booted to the SSD, shows the SSD as a single partition (boot, page file, active, crash dump, primary partition). The HDD is listed then as 3 partitions: system reserved (system, active, primary); a primary partition; and a recovery partition.

I've loaded the optimised settings in the BIOS.
 
Did you have the toshiba drive still connected while installing windows fresh to the ssd??

If so the primary boot partition has likely ended up on the toshiba instead of the ssd.

A full reformat/reinstall with only the ssd connected should solve this.
 
Solution
Jan 10, 2019
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Thanks, and yes I did have it attached. However, when I tried initially to install on the SSD without the HDD being in place, the installer reported that it was not possible to install because the SSD was unsuitable. I spent hours trying to find out why that was, too, and got nowhere - probably something to do with GPT.

I guess the only thing to do is try yet again to fresh install without the HDD being present and cross everything. I will report back. Thanks again.
 
Jan 10, 2019
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That worked, thanks. For some reason, if I then swap out the SSD and try to boot from the HDD (I forgot to do something, hence wanting to do that), the HDD reports that now it is the device that will not boot, although the error message is different. No big deal.