I am selling my old laptop and I do not want my data to be recoverable with recovery tools.
I found this post How to wipe a hard disk completely so that no data recovery tools can retrieve anything? explaining that the shred
command can do that.
I am just wondering on what partitions and in which order should I use this.
Here is the output of fdisk -l
:
fdisk -l
Disk /dev/mmcblk0: 29.1 GiB, 31272730624 bytes, 61079552 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: someidentifier
Device Start End Sectors Size Type
/dev/mmcblk0p1 2048 1050623 1048576 512M EFI System
/dev/mmcblk0p2 1050624 2050047 999424 488M Linux filesystem
/dev/mmcblk0p3 2050048 61077503 59027456 28.2G Linux filesystem
Disk /dev/mmcblk0boot1: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mmcblk0boot0: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/mmcblk0p3_crypt: 28.1 GiB, 30219960320 bytes, 59023360 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/ubuntu--vg-root: 26.2 GiB, 28143779840 bytes, 54968320 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/ubuntu--vg-swap_1: 1.9 GiB, 2051014656 bytes, 4005888 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Thank you