blkdiscard man page on Archlinux

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BLKDISCARD(8)		     System Administration		 BLKDISCARD(8)

       blkdiscard - discard sectors on a device

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

       blkdiscard  is  used  to	 discard  device  sectors.  This is useful for
       solid-state drivers  (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!

       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
	      Display help text 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

       -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 discarded blocks possibly  cre‐
	      ated  by	garbage	 collection must also be erased.  It has to be
	      supported by the device.

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

       Lukas Czerner ⟨⟩


       The blkdiscard command is part of the util-linux package and is	avail‐
       able  Linux  Kernel Archive ⟨

util-linux			 October 2012			 BLKDISCARD(8)

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