I realise it is the default for external drives but not sure about other partitions on a users system drive. I don't have separate partitions on my machine so I can't look for myself 😉
Is “ignore volume ownership” the default for non-system partitions
partitionpermission
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Best Answer
From OS X Support Essentials 10.6: "The Mac considers any locally mounted volume that is not the system volume to be an external volume. Thus, other partitions on your internal system disks will still be considered external volumes."