The title pretty much explains the issue, but more details. I have a 128GB ssd that windows is on, I added a 500GB ssd to have linux installed on. After installing linux, left the win10 drive plugged in, linux didn't show on the boot menu. I'd read that dual booting windows and linux that windows gets installed first, then linux after unplugging the windows drive, I did this and got linux back, but now windows isn't showing. I've read a lot about restoring the linux entry, but few restoring windows, and those didn't fit. I checked out a couple threads in different forums here, not a fit. Any help at all would be appreciated

Presuming UEFI, it's probably just a default boot issue. From a Linux terminal run efibootmgr, it will list the known boot targets. Use the "-o" option to re-arrange them so the Linux one is first. Ensure all the SSDs are installed and reboot.

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If you did not have the windows drive attached when you installed Linux, did you then run grub-mkconfig from Kali to update the boot menu to include windows. If the windows drive wasn't attached when you installed Kali there would be no way it could add windows to the boot menu during the install. Also, was your windows 10 pre-installed and are both windos and Kali installed UEFI?

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Thought this would do it, it sure looked like it. So I went into the bios and tried to change the boot order, it had 7 presets that I couldn't find a way to alter. Did get windows back, but lost linux.

Thank you for your help

Tried this, didn't work. Thank you for your help, if not for your suggestions and those of syg00 I'd not have found the answer. Update-grub did it. I can't believe I didn't try that earlier.

Well, it seems the solution was quite simple, but I didn't think of it, but with the help of the two replies I was able to solve it. update-grub solved it