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BLKDISCARD(8)                System Administration               BLKDISCARD(8)



NAME
       blkdiscard - discard sectors on a device

SYNOPSIS
       blkdiscard [-o offset] [-l length] [-s] [-v] device

DESCRIPTION
       blkdiscard  is used to discard device sectors.  This is useful for solid-state drivers (SSDs) and thinly-provi-
       sioned 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!

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.

       -h, --help
              Print help and exit.

       -o, --offset offset
              Byte  offset  in  the device from which to discard.  Provided value will be aligned to the device sector
              size.  Default value is zero.

       -l, --length length
              Number of bytes after starting point to discard.  Provided value will be aligned to  the  device  sector
              size.   If  the  specified  value extends past the end of the device, blkdiscard will stop at the device
              size boundary.  Default value extends to the end of the device.

       -s, --secure
              Perform secure discard.  Secure discard is the same as regular discard except all  copies  of  the  dis-
              carded blocks possibly created by garbage collection must also be erased.  It has to be supported by the
              device.

       -v, --verbose
              Print aligned offset and length arguments.

AUTHOR
       Lukas Czerner

SEE ALSO
       fstrim(8)

AVAILABILITY
       The blkdiscard command is part of the util-linux package and is available Linux Kernel Archive



util-linux                       October 2012                    BLKDISCARD(8)