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After I got a new and bigger SSD, I wanted to install Windows 10 on it. For some reason BIOS did not list my bootable USB device, with the Windows 10 installation. So I connected it thorugh SATA instead, and now it would let me install Windows 10. Problem is, everytime I disconnect the HDD where the Windows 10 installation is located, I get the error: "Reboot and Select proper Boot device" during boot. When I connect the HDD, it seems to boot from the installation HDD, and let me choose to open into Windows 10 (on the SSD). I can then use Windows 10 normally.

Som other info:

When the installation HDD is disconnected and I go into BIOS, the SSD is the only thing listed under boot devices. If I choose the SSD manually from BIOS, I get the same error message.

At first under the Windows 10 installation, I coulnd't install on the SSD because of it being a GPT-partition. I used Diskpart and then installed Windows 10.

I have tried to set the SSD as "active" with Diskpart.

BIOS Mode

MSInfo32 shows: Legacy

Title shown in BIOS menu: UEFI BIOS Utility - EZ Mode

BIOS when old and new SSD is connected. The old SSD (with working Windows 10) has the UEFI label.

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  • BIOS (Legacy) or UEFI? Different procedures...
    – user931000
    Commented Mar 25, 2019 at 13:42
  • Probably your partition containing the installer on the hdd is now marked as the "System" partition. Could you check that in disk management? Meaning you don't have a rescue system partition installed on the ssd.
    – xenoson
    Commented Mar 25, 2019 at 14:36
  • I think you are right. I don't have a rescue system partition installed on the SSD. Why is that? Wouldn't it normally be created when installing Windows 10?
    – LUPINE
    Commented Mar 25, 2019 at 14:43
  • This is really messed up. You could just install BCD on you windows partition. But I would highly recommend to try again with your installation hdd connected via usb. Make sure you find the boot option labled UEFI. Your usb device should show up twice, take the UEFI one.
    – xenoson
    Commented Mar 25, 2019 at 14:44
  • Why is that? That's what the window setup used to do if it finds an internal hard drive with an existing BCD boot loader. Maybe you like it that way. Saves space on the ssd :)
    – xenoson
    Commented Mar 25, 2019 at 14:50

1 Answer 1

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So I found a USB drive that worked. I'm not sure what went wrong, when trying to connect. Now I got a fully functional Windows 10.

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