[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...

[wtallis]

On newer SSDs, the sanitize command would be preferable for this use over the format command. IIRC, the format command doesn't require quite as strong a security guarantee as the sanitize command: the latter ensures that user data is cleaned from both the flash and all buffers, CMBs, etc.