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How to wipe RAID superblock? wipefs: error: /dev/sda: probing initialization failed

co flag

I want to format my external USB. lsblk shows

sda           8:0    1  57.6G  0 disk 
├─sda1        8:1    1   2.9G  0 part /media/miki/Ubuntu 20.04.3 LTS amd64
├─sda2        8:2    1   3.9M  0 part 
└─sda3        8:3    1  54.8G  0 part /media/miki/writable

I tried standard procedures

sudo mdadm --zero-superblock /dev/sda
mdadm: Couldn't open /dev/sda for write - not zeroing

And wipefs

sudo wipefs -a /dev/sda
wipefs: error: /dev/sda: probing initialization failed: Device or resource busy

What should I try now? What is the root cause of the problem?

mangohost

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