How to change partition RAID Member

Question

I would like to change the partition of my HD, an exception is thrown when I try to change or delete the whole disk volume. See the image of my HDD below:

My actual setup. I would like to delete /dev/sda1.
The error:

Can anyone help me, please?

Welcome to [ubuntu.se]! ;-) What are you trying to accomplish? Use the disks separately instead of in a RAID config??? — Fabby, Jun 19 '19 at 13:29
Hi Fabby, how are you? So I had a raid on another machine running. this error hd is what was part of a raid array. I would like to clean it and redo a new raid configuration on this machine. — Júlio Amorim, Jun 19 '19 at 13:34
Possible duplicate of remove mdadm raid1 without loosing data — Fabby, Jun 19 '19 at 13:39
I think not Fabby, my problem is not with the md0 array but in not being able to delete the disk /dev/sda1 — Júlio Amorim, Jun 19 '19 at 13:49
You need to break the array before you can do anything with the disk... Try out the duplicate first. — Fabby, Jun 19 '19 at 13:53

score 0 · Accepted Answer · answered Jun 19 '19 at 14:30

Just as Fabby said, you have to stop the array before making any changes. I did not have that in mind, thank you Fabby.

Here is the solution step by step:

# mdadm -S /dev/md0

# mdadm /dev/md0 -r /dev/sda

# dd if=/dev/zero of=/dev/sda bs=1M count=1024

after changes

# rm /etc/mdadm/mdadm.conf

How to change partition RAID Member

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