Mac OS X: Destroy all partitions in USB pendrive

#--> first identify your USB disk: fdisk list # --> Example OUTPUT : ' /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_APFS Container disk1 1.0 TB disk0s2 /dev/disk1 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +1.0 TB disk1 Physical Store disk0s2 1: APFS Volume Macintosh HD - Datos 907.8 GB disk1s1 2: APFS Volume Preboot 81.5 MB disk1s2 3: APFS Volume Recovery 526.6 MB disk1s3 4: APFS Volume VM 2.1 GB disk1s4 5: APFS Volume Macintosh HD 11.0 GB disk1s5 /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: Apple_partition_scheme *248.7 GB disk2 1: Apple_partition_map 4.1 KB disk2s1 2: Apple_HFS 4.1 MB disk2s2 ' #--> in this example USB stick is disk2 (external, physical): # --> let's blank complete pendrive: sudo dd if=/dev/zero of=/dev/disk2 count=1 bs=4096 # Then you can run disk utility to initialize / format pendrive.
You can do this procedure when pendrive results unreadable or when it is not possible to access pendrive from macosx. This will delete all partitions (and all information) but you will restore access to your pendrive.

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