I have an existing RAID-0 device that I would like to convert to RAID-5.

I've done the necessary changes to my /etc/raidtab, but mkraid fails because
(I assume) it finds an existing persistent superblock on the old RAID-0
partitions.

So my question becomes: How does one erase the raid persistent superblock
from a physical partition? Or, more generally, what'd be the right way to
switch from RAID-0 to RAID-5?

Thanks.

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