• no extra install to specific tools: wipe or shred .
• you can get strong erases like VSITR, but a little bit weak.

## check the partitions
fdisk -l

## erase the partition:
badblocks -wns /dev/sdb6

• one badblocks takes 2days (49:12:39).
• my dev/sdb6 is about 600GB,
• my device is Raspberry Pi 3B+.

refer to VSITR requirement::

0x00 -> 0xFF ->
0x00 -> 0xFF ->
0x00 -> 0xFF -> 0xAA

from badblocks manual::

0xAA -> 0x55 -> 0xFF -> 0x00

log:

- 48:22:50 : 85.11%

+ 14.89% x (2sec/0.01%) => 49:12:39