In this case, it is not showing the second boot option, because the problem is probably with that installation.
What error did you make? share a screenshot please.
Just keep disk b connected, let's try to fix this installation.
How to boot to second windows drive
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Anonimowe
I got 2 ssds in my system. Lets call the first one 'a' - it has my original system. The other one is 'b' and i just installed the system on it. The problem is, I can't boot into my disk 'b'. BIOS only shows "windows boot manager" in the boot order, and the menu that appears after restarting while holding shift has no option to change boot. Also the system on disk 'b' couldn't connect to the internet.
Windows dla domu | Windows 10 | Instalacja i uaktualnienie
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Anonimowe
2021-11-12T19:13:16+00:00 -
Anonimowe
2021-11-12T19:10:53+00:00 It did not recognize any other installations. In addition, I tried to re-install windows on the disk b, but it said there was an error with the partition
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Anonimowe
2021-11-12T18:41:43+00:00 Make sure the Secure Boot option is turned on.
If so, try disabling it to see if you can change the boot order.
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Anonimowe
2021-11-12T18:38:28+00:00 Sorry, the link appeared duplicated, so I could only see one image, but now it works.
Perform the following test, turn off the computer, disconnect the sata cable from disk a, then try to turn on the computer, and check if the BIOS identifies the other installation, and if Windows loads normally.
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Anonimowe
2021-11-12T18:31:27+00:00 The second image shows what appears - first option is windows boot manager and the second one is Disabled. Is there any way to simply disable windows boot manager and use uefi boot order?