Comment by tylerjd

Probably something along the lines of secure erase. Most modern SSDs/NVMe drives are encrypted by default in firmware. All the firmware needs to do is throw away the old keys and generate new ones. It's better than zeroing the drive as there is no wear to the write cycles and guarantees that the slack space in the SSD is also cleared, which DD'ing to /dev/nvme0 wont be certain of. The nvme-format tool can be used for this: http://manpages.ubuntu.com/manpages/zesty/man1/nvme-format.1...