With mdadm --zero-superblock you can remove md info from the partition
(prior to deleting the partition table entry)

Otherwise dd zeros to the partition or try to use the --force
mkfs/gparted.

** Summary changed:

- Old raid array blocks format of new partition
+ old superblocks can prevent formating a new partition

** Changed in: mdadm (Ubuntu)
       Status: New => Confirmed

** Also affects: gparted (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- old superblocks can prevent formating a new partition
+ old raid superblocks can prevent formating a new partition

-- 
old raid superblocks can prevent formating a new partition
https://bugs.launchpad.net/bugs/342777
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