Can't create mirrored drives

[BillJunk]

I've been trying to create mirrored drives using two Seagate 5 TB drives ( Disks 4 & 5 ) that have the same available space. All goes well until I get to the very last step and I get the error message "The operation is not supported by the object." Is there something I'm doing wrong? I start with two drives whose space is unallocated and follow what the "wizard" tells me to do.

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