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 binary (2^N) suffixes KiB, MiB,
GiB, TiB, PiB and EiB (the "iB" is optional, e.g. "K" has the same meaning as
"KiB") or decimal (10^N) suffixes KB, MB, GB, PB and EB.