wipefs - wipe a signature from a device
] [-o offset
can erase filesystem, raid or partition-table signatures (magic
strings) from the specified device
to make the signatures invisible for
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.
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
the same filesystem or partition table will still be visible
because of another magic string on another offset. The option --no-act
is also affected by this behavior and only the first magic string for the
filesystem is reported.
When option -a
is used, all magic strings that are visible for libblkid
are erased. In this case the wipefs
scans the device again after each
modification (erase) until no magic string is found.
Note that by default wipefs
does not erase nested partition tables on
non-whole disk devices. For this the option --force
- -a, --all
- Erase all available signatures. The set of erased
signatures can be restricted with the -t option.
- -b, --backup
- Create a signature backup to the file
$HOME/wipefs-<devname>-<offset>.bak. For more details see the
- -f, --force
- Force erasure, even if the filesystem is mounted. This is
required in order to erase a partition-table signature on a block
- -h, --help
- Display help text and exit.
- -n, --no-act
- Causes everything to be done except for the write()
- -o, --offset offset
- Specify the location (in bytes) of the signature which
should be erased from the device. The offset number may include a
"0x" prefix; then the number will be interpreted as a hex value.
It is possible to specify multiple -o options.
The offset argument may be followed by the multiplicative suffixes
KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and
YiB (the "iB" is optional, e.g. "K" has the same
meaning as "KiB"), or the suffixes KB (=1000), MB (=1000*1000),
and so on for GB, TB, PB, EB, ZB and YB.
- -p, --parsable
- Print out in parsable instead of printable format. Encode
all potentially unsafe characters of a string to the corresponding hex
value prefixed by '\x'.
- -q, --quiet
- Suppress any messages after a successful signature
- -t, --types list
- Limit the set of printed or erased signatures. More than
one type may be specified in a comma-separated list. The list or
individual types can be prefixed with 'no' to specify the types on which
no action should be taken. For more details see mount(8).
- -V, --version
- Display version information and exit.
- wipefs --all --backup /dev/sdb
- Erases all signatures from the device /dev/sdb and creates
a signature backup file ~/wipefs-sdb-<offset>.bak for each
- dd if=~/wipefs-sdb-0x00000438.bak of=/dev/sdb
seek=$((0x00000438)) bs=1 conv=notrunc
- Restores an ext2 signature from the backup file
Karel Zak <email@example.com>
- enables libblkid debug output.
The wipefs command is part of the util-linux package and is available from