If it is a second hard drive… Probably the win bootloader is on the first still? Check bios boot options

Maybe its destiny telling you you can do it without windows

Given that you installed Linux on a separate drive, it’s likely that the Windows bootloader is perfectly fine but your BIOS chooses to prioritize the Linux disk. I would check if you can still select the Windows drive / installation in the BIOS / boot media selection.

Typically, Fedora should also add the Windows installation to its bootloader (https://docs.fedoraproject.org/en-US/quick-docs/grub2-bootloader/#_adding_other_operating_systems_to_the_grub2_menu). It uses os-prober to find other operating systems. Can you post the output of sudo os-prober?

Edit: The output of lsblk -f would also be useful (though you may want to anonymize it first).

It’s usually the opposite…

Windows install will have a back up bootloader that you can copy over or you can use the install media

I’ll give the install media instructions, you can do it from your Linux install if it’s able to see the Windows files

Launch Command Prompt with Shift+F10

List Disks with

list disk

Select desired disk with

sel disk #

Create the boot partition

create partition efi size=100

Select Boot

sel partition 1

Format Boot

format fs=FAT32 quick

Assign Boot partition

assign letter=g:

Copy the boot files to the partition

bcdboot c:\Windows /s G: /f ALL

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Which index were these disks arranged in? Windows will install its bootloader on 0 regardless of where you physically install the OS.

I like to keep OS disks self contained, and tend to completely remove other connected disks when conducting a new install. This is a must for Windows, I’ve not had a Linux distro place it’s bootloader in anything other than the OS destination.

You can also install ReFind and it’ll find all bootable partitions when it boots next time, but it’ll probably look a lot messier than Grub until you figure out how to mask the extra entries you’ll get for the Fedora stuff.