I've split my 2TB HDD + 128GB SDD Fusion Drive into two separate disks so I can make better use of it by taking control on what is stored where. The process was fairly simple so I ended up with macOS installed on "SSD" and "HDD" for other storage.

This is how it looks now:

$ diskutil list
/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         121.3 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk2         121.0 GB   disk0s2

/dev/disk1 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:                  Apple_HFS HDD                     2.0 TB     disk1s2

/dev/disk2 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +121.0 GB   disk2
                                 Physical Store disk0s2
   1:                APFS Volume SSD                     70.1 GB    disk2s1
   2:                APFS Volume Preboot                 45.3 MB    disk2s2
   3:                APFS Volume Recovery                510.3 MB   disk2s3
   4:                APFS Volume VM                      4.3 GB     disk2s4

Is it normal to have EFI partitions on both drives? Or could it be just one? If so – which one macOS is using for boot?

Why I ended up in here? I wanted to make use of Boot Camp and install Win10 on "HDD".

But when I select disk1 as target in Boot Camp, I get this message:

This disk contains Windows partition.

And three options to choose from:

  1. Create second partition for Windows.
  2. Erase disk and create single partition for Windows.
  3. Restore single macOS partition.

All would be just fine to select option #1, but... it is grayed out and disabled.

disk1s2 partition is type of Mac OS Extended (journaled). I'm assuming that Boot Camp says "...disk already contains Windows partition" because it has EFI?

Is there any way to use Boot Camp in this situation? Erasing "HDD" partition is not an option.

PS I can create another FAT32 partition by splitting "HDD" partition in Disk Util. But this changes nothing in context of Boot Camp.

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