Setting up dual boot with Windows 10

I have Windows 10 installed on a SSD (gpt) and I’m trying to set up dual boot with Endeavour. I was just wondering, how would I set up dual boot so that I install Endeavour on my SSD and use an external hard drive (mbr) as the storage? I know I have to shrink my SSD’s partition, but how much is enough?

Thank you for any replies.

It of course differs from person to person, what you intend to do.

After few months of Endevour OS usage I settled at 60 GB - no gaming, while trying to keep my system clean. Documents are on a separate disk. Most of the space is occupied by Spotify, Docker and Yay. Have 3 kernels.

You can always start with 40 GB, and resize partitions later again, by using live ISO

This will be helpful:

PS. I use XFCE4, and with my 16 GB of RAM I just didn’t need to create swap.

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Hello everyone,
I have a question in this subject, i don’t know if i open a new topic or not.
But i have a windows 10 already installed(uefi) on a ssd (nvme) and i want to install EOS on another ssd (sata) and i wanted to know what is the good policies to avoid trouble between the bootloader of windows and the EOS one?
I already disable secure boot and fast boot one the uefi, do i have to make some good preventive thing on the installation and after? Choose a good bootloader for EOS? Someone in the past suggest me to use refind if iam not wrong. This is a good choice?
In few month i will try to install Arch on another ssd in a encrypted way, for information.
Honestly in the past i have so many trouble with eos and w10 that i decided to never have w10 and linux in same time on my pc so iam a bit chilly :fearful:
Thank you all
Edit: there’s nothing pressing about my request