I believe that the files in /dev/sdb5 are the proper boot files.    Would it be as simple as moving the files from that directory to the FAT32 partition ?

On Tue, Nov 3, 2020 at 1:43 AM Samuel Sieb <samuel@sieb.net> wrote:
On 11/2/20 10:35 PM, linux guy wrote:
> I can't remember exactly what I did, but I think I copied an F31 install
> onto an existing F31 install on a hard drive that had Windows 10 on
> it.   I did this in early 2020.  Didn't keep notes. :(
>
> Now I have a hard drive that will boot Windows 10 fine, via the Windows
> 10 Boot Manager.
>
> When I go into the BIOS manager, it shows 2 boot options: Windows 10 via
> the Windows 10 Boot Manager and the hard drive device itself.
>
> If I choose Windows 10, Win 10 boots fine.  :(
> If I choose the hard drive device itself, the BIOS says to insert a
> valid boot device.
>
> When I look at the hard drive with GParted, I see this:
>
> Samsung SSD 850 EVO mSATA 500 GB with:
> /dev/sdb1   ntfs Recovery (Windows)
> /dev/sdb2  fat32  EFI System Partition Has a boot flag
> /dev/sdb3  unknown type  Microsoft Reserved Partition
> /dev/sdb4  ntfs  Basic data partition
> /dev/sdb5  ext4    <--- this is the boot partition, has the boot stuff
> on it.  Has a boot flag.
> /dev/sdb6  lvm2 pv   fedora
>
> A fedora "device" which has 3 partitions:
> /dev/fedora/home  ext4   the home directory
> /dev/fedora/root   ext4
> /dev/fedora/swap  linuxswap
>
> I used a live USB version to facilitate the copy.  I suspect that the
> live boot got installed (thus the FAT32 partition) instead of the real
> boot partition, which is /dev/sda5 right now.

The FAT32 partition is the EFI boot partition.  Did this disk ever work
with Fedora?  I expect that you didn't copy the Fedora files that were
in that partition on wherever you copied it from.  It's tricky to fix
that.  Do you still have whatever drive you copied it from originally?
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