List all mounted disk include hidden disk
diskutil list
Like
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Backup 465.6 GB disk0s2
3: Apple_HFS Data 533.6 GB disk0s3
/dev/disk1 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *240.1 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_HFS OSX 239.2 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *128.0 GB disk2
1: EFI EFI 209.7 MB disk2s1
2: Apple_APFS Container disk3 127.8 GB disk2s2
/dev/disk3 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +127.8 GB disk3
Physical Store disk2s2
1: APFS Volume Preboot 19.1 MB disk3s2
2: APFS Volume Recovery 517.4 MB disk3s3
3: APFS Volume VM 4.3 GB disk3s4
Delete the volume
diskutil apfs deleteVolume /dev/disk3s1
Delete the container
diskutil apfs deleteContainer /dev/disk3