Multi-booting

[Wild_Bill]

Greetings,

I would very much like to install a Windows 11 system alongside my Windows 10 Pro.
The first line on the BootIt UEFI Products page quickly got my attention.
"Manage your partitions, install and boot multiple operating systems with ease..."
I have been looking for instructions on how to have a multi-boot system, but I
have not been able to find them anywhere. I know they're out there, but I don't
know where.

Does anyone know of a book, or a magazine article, or a web page where I can
find out what I need to do?

Thank-you.

[TeraByte Support]

https://www.terabyteunlimited.com/howto/

It's linux / win10 but same concept to add Win10 to Win11. Step 1, disable fast startup, install BIU.. when ready to add w10, boot back to bootit, reduce size of Win11 partition, ensure EFI System partition at least 450MiB (make larger if wanting more), then ctrl-alt-del and boot your windows 10 installation media and install to new free space or partition you created. The main key with BIU is to boot back to BootIt before you boot to the boot media.

[Wild_Bill]

I'm not finished yet, but I'm getting there.
It took me about three hours to figure out how to get the EFI partition enlarged while I was still in Windows.
I found the answer somewhere in Image for Linux of all places.

Anyway, I better get some sleep. I'll continue tomorrow after I get home from work.

Thanks again. I do appreciate this.

[Wild_Bill]

Alright. I did it.

The best advice I can give anyone who's thinking about multi-booting is to be sure you back
EVERYTHING up before you do your first "boot back", (or is it "back boot"? I can't remember.)
All I know is it's worth it after you've finished.

Many thanks to the TeraByte Support man for all the valuable hints and advice that made it
all so much easier.