Possible to have multiple partitions with RAID 1?

I have  a 4TB MyBook Thunderbolt Duo and would like to partition drive A into 2 partitions and also be running RAID 1 (mirrored). Every time I partition it with Disk Utilities on Mac, WD Drive Utilities rebuilds it and I lose my partitions. Is it possible to have multiple partitions with RAID 1? I want the partitions and data on disk A to be mirrored on disk B.

I’m just guessing but RAID 1 is mirrored so I would think both drives would need to be identically partitioned.

Joe

Thanks Joe. I get the feeling that it will still re-build even if I did that. Would be great if someone could let me know for sure. Thanks anyway!