Shred - overwrite data on a whole device with random bits.
1. Identify the name of the device
fdisk -l
Disk /dev/sdc: 931,53 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: SAMSUNG HD103SJ
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
2. Execute command:
: sudo shred -v -n1 -z /dev/sdX -v flag is verbose and will print the current progress -n1 overwrite blocks on the device "n1" times -z set all bits to zero after the last iteration ....
shred: /dev/sdc: pass 2/2 (000000)...920GiB/932GiB 98%
shred: /dev/sdc: pass 2/2 (000000)...921GiB/932GiB 98%
shred: /dev/sdc: pass 2/2 (000000)...922GiB/932GiB 98%
shred: /dev/sdc: pass 2/2 (000000)...923GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...924GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...925GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...926GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...927GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...928GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...929GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...930GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...931GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...932GiB/932GiB 100%
