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openSuSE Customized Partitioning
This is the control-freak path, actually several steps from the previous screen shot.
First I un-checked the box for a separate home partition, then I clicked Edit Partition Setup to get into the Expert Partitioner.
I then deleted the root partition from the suggested layout, and put root on the 64GB partition I had created with gparted earlier.
The installer had already found and used the swap partition I had created, and the EFI Boot partition, so there was nothing else to do for those.
Of course it is unusual to leave a huge unallocated area on the disk, but I will be installing other Linux distributions to this system, so I am leaving the space for that.
openSuSE confirm formatting query
Wow, how scary does that sound? This screen is shown because we have been into the Expert Partitioner, and on exit it found that we are using a partition that is not going to be formatted. In this case that is not a problem, it is exactly what we want because the partition in question is the EFI Boot partition, and if we formatted it we would lose the Windows boot information. I click Yes and move on to the next step.
openSuSE Partitioning Confirmation
This is the confirmation of the partitioning layout. Note that the root partition is shown in red as a warning, because it is formatting an existing partition (the one which I created with gparted before starting the installer), and it shows /dev/sda2 being mounted to /boot/efi without being formatted. Oh, and you can also see here that I cleared the Separate Home Partition check-box.