Dual boot but windows OS not detected [SOLVED]

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Dual boot but windows OS not detected [SOLVED]

Postby johnbr8 » 2018-12-31 04:51

I have installed Debian stretch to a primary partition on my second hard drive but stopped short of installing Grub to the first HDD when it said Linux was the only OS detected.

I did end up installing Grub, but not wanting to mess up the Windows boot manager, I installed it to the second HDD. What should I do now bearing in mind that Windows is currently my main system. Thanks.
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Last edited by johnbr8 on 2019-01-01 01:30, edited 1 time in total.
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Re: Dual boot but windows OS not detected

Postby Head_on_a_Stick » 2018-12-31 08:33

Is Windows booting in UEFI mode?

With the drives connected, please post the output of
Code: Select all
parted --list

Thanks!
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Re: Dual boot but windows OS not detected

Postby johnbr8 » 2018-12-31 20:32

Both drives are connected and normal boot is UEFI.
However when I was making the DVD drive bootable in the BIOS I selected the non EFI option and I wonder if that is the problem.
Unfortunately after going into the BIOS again the EFI option is not listed for the DVD drive - so I will have to figure how to get it back.
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Re: Dual boot but windows OS not detected

Postby Head_on_a_Stick » 2018-12-31 23:46

johnbr8 wrote:when I was making the DVD drive bootable in the BIOS I selected the non EFI option and I wonder if that is the problem

Probably — if the installer was not booted in UEFI mode then it will not install in UEFI mode and a UEFI Windows system would not be detected.

Toggling CSM or "Legacy" mode should allow you to switch between the operating systems.

Alternatively, reinstall Debian with the installer booted in UEFI mode (or convert the installed system to UEFI booting).
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Re: Dual boot but windows OS not detected [SOLVED]

Postby johnbr8 » 2019-01-01 01:33

I reinstalled Debian by booting the installation DVD in UEFI mode; Windows was detected and I now have a working dual boot. Thanks for your help.
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Re: Dual boot but windows OS not detected [SOLVED]

Postby mondharris » 2019-01-06 12:41

Thanks UEFI mode was the correct way to install, I now too has a dual boot OS. Thank you!
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