Wiping Data

Securely delete data.

shred

Tool to overwrite single file contents and optionall delete file.

35 pass random data, zero then remove file.

shred --iterations=35 --verbose --zero --remove {FILE}

Recursively overwrite file data.

find . -type f -exec shred --iterations=35 --verbose --zero --remove {} \;

Tool to securely delete files and block devices.

apt install wipe

Recursively delete files, 35 pass random data.

wipe -r -c -f -Q 35 {FILE OR DIR}

Wipe a block device, 35 pass random data.

wipe -k -Q 35 {BLOCK DEVICE}

Using dd to zero disks. Good for testing/setup of new drives.

Writing all Zero’s to Drive (quick).

dd if=/dev/zero of=/dev/sdX bs=1M &

Note

~3-4 hours @ 1.5TB

Writing all One’s to Drive (quick).

tr '\000' '\377' < /dev/zero | dd of=/dev/sdX bs=1M &

Note

~4-5hours @ 1.5TB

Checking Status on DD.

ps -ef | grep dd
kill -USR1 {PID}

Download DBAN boot & nuke then run DoD 3 pass.

References