@tkissing Make sure you create a separate /boot/EFI partition ON THE LINUX SSD, and not use the #Microslop one. Be aware that Windows has been known to wreck the Linux EFI partition in the past, so that's what can happen, in which case you will need to reinstall the bootloader. Give your / partition 45-60GiB, and create a separate /home partition with the rest of the space.