NAME
blkdiscard - discard sectors on a device
SYNOPSIS
blkdiscard [options] [-ooffset] [-llength] device
DESCRIPTION
blkdiscard is used to discard device sectors. This is useful for solid-state drives (SSDs) and thinly-provisioned storage. Unlike fstrim(8), this command is used directly on the block device.
By default, blkdiscard will discard all blocks on the device. Options may be used to modify this behavior based on range or size, as explained below.
The device argument is the pathname of the block device.
WARNING: All data in the discarded region on the device will be lost!
Since util-linux v2.41, fdisk has the ability to discard sectors on both partitions and unpartitioned areas using the 'T' command. Additionally, sfdisk has the option --discard-free to discard unpartitioned areas.
OPTIONS
The offset and length arguments 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.
-f, --force
-o, --offsetoffset
-l, --lengthlength
-p, --steplength
-q, --quiet
-s, --secure
-z, --zeroout
-v, --verbose
-h, --help
-V, --version
EXIT STATUS
blkdiscard has the following exit status values:
0
1
2
AUTHORS
Lukas Czerner <[email protected]>, Karel Zak <[email protected]>
SEE ALSO
fstrim(8)
REPORTING BUGS
For bug reports, use the issue tracker <https://github.com/util-linux/util-linux/issues>.
AVAILABILITY
The blkdiscard command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.