CmdID

CmdID / Commands

blkdiscard

Discard device sectors (permanetly deleting data). toybox

On Linux

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Linux

from the toybox, 0BSD

Discard device sectors (permanetly deleting data). Free space can improve flash performance and lifetime by wear leveling and collating data. (Some filesystem/driver combinations can do this automatically.) OFFSET and LENGTH must be aligned to the device sector size. Default without -o/-l discards the entire device. (You have been warned.)

blkdiscard [-szf] [-o OFFSET] [-l LENGTH] DEVICE
-o OFFSETStart at OFFSET (--offset, default 0)
-l LENGTHLENGTH to discard (--length, default all)
-sOverwrite discarded data (--secure)
-zZero-fill rather than discard (--zeroout)
-fDisable check for mounted filesystem (--force)

Linux

from tldr-pages, CC BY 4.0

Discard device sectors on storage devices. Useful for SSDs.

Discard all sectors on a device, removing all data

blkdiscard /dev/deviceIdentify

Securely discard all blocks on a device, removing all data

blkdiscard --secure /dev/deviceIdentify

Discard the first 100 MB of a device

blkdiscard --length 100MB /dev/deviceIdentify