Usage:
 blkdiscard [options] <device>

Discard the content of sectors on a device.

Options:
 -f, --force         disable all checking
 -l, --length <num>  length of bytes to discard from the offset
 -o, --offset <num>  offset in bytes to discard from
 -p, --step <num>    size of the discard iterations within the offset
 -q, --quiet         suppress warning messages
 -s, --secure        perform secure discard
 -v, --verbose       print aligned length and offset
 -z, --zeroout       zero-fill rather than discard

 -h, --help          display this help
 -V, --version       display version

Arguments:
 Values for <num> may be followed by a suffix: KiB, MiB,
 GiB, TiB, PiB, EiB, ZiB, or YiB (where the "iB" is optional).

For more details see blkdiscard(8).