wipefs — wipe a signature from a device
−o offset ] device...
erase filesystem, raid or partition-table signatures (magic
strings) from the specified
device to make the signatures
invisible for libblkid.
wipefs does not erase the filesystem itself nor any other data from the device. When used without any options, wipefs lists all visible filesystems and the offsets of their basic signatures.
wipefs calls the BLKRRPART ioctl when it has erased a partition-table signature to inform the kernel about the change.
Note that some filesystems and some partition tables store
more magic strings on the device. The wipefs command lists only
the first offset where a magic string has been detected. The
device is not scanned for additional magic strings for the
same filesystem. It is possible that after a wipefs -o
offset the same filesystem or
partition table will still be visible because of another
magic string on another offset.
−a is used,
all magic strings that are visible for libblkid are
Note that by default wipefs does not erase
nested partition tables on non-whole disk devices. For this
Erase all available signatures. The set of erased
signatures can be restricted with the
Create a signature backup to the file
more details see the
Force erasure, even if the filesystem is mounted. This is required in order to erase a partition-table signature on a block device.
Display help text and exit.
Causes everything to be done except for the write() call.
Specify the location (in bytes) of the signature
which should be erased from the device. The
offset number may include
a "0x" prefix; then the number will be interpreted as a
hex value. It is possible to specify multiple
argument may be followed by the multiplicative suffixes
KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB,
PiB, EiB, ZiB and YiB (the "iB" is optional, e.g. "K"
has the same meaning as "KiB"), or the suffixes KB
(=1000), MB (=1000*1000), and so on for GB, TB, PB, EB,
ZB and YB.
Print out in parsable instead of printable format. Encode all potentially unsafe characters of a string to the corresponding hex value prefixed by '\x'.
Suppress any messages after a successful signature wipe.
Limit the set of printed or erased signatures. More than one type may be specified in a comma-separated list. The list or individual types can be prefixed with 'no' to specify the types on which no action should be taken. For more details see mount(8).
Display version information and exit.
Erases all signatures from the device /dev/sdb and creates a signature backup file ~/wipefs-sdb-<offset>.bak for each signature.
dd if=~/wipefs-sdb-0x00000438.bak of=/dev/sdb seek=$((0x00000438)) bs=1 conv=notrunc()
Restores an ext2 signature from the backup file ~/wipefs-sdb-0x00000438.bak.