In this case the wipefs scans the device again after each modification (erase) until no magic string is found. When option -a is used, all magic strings that are visible for libblkid(3) are erased. The wipefs command (since v2.31) lists all the offset where a magic strings have been detected. Note that some filesystems and some partition tables store more magic strings on the device (e.g., FAT, ZFS, GPT). This feature can be used to wipe content on partitions devices as well as partition table on a disk device, for example by wipefs -a /dev/sdc1 /dev/sdc2 /dev/sdc. The ioctl is called as the last step and when all specified signatures from all specified devices are already erased. Wipefs calls the BLKRRPART ioctl when it has erased a partition-table signature to inform the kernel about the change. Always explicitly define expected columns by using -output columns-list in environments where a stable output is required. So whenever possible, you should avoid using default outputs in your scripts. When used without any options, wipefs lists all visible filesystems and the offsets of their basic signatures. wipefs does not erase the filesystem itself nor any other data from the device. Wipefs can erase filesystem, raid or partition-table signatures (magic strings) from the specified device to make the signatures invisible for libblkid.
Display signatures for specified device: sudo wipefs /dev/sdX.
Wipe a signature from a device Examples (TL DR)
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